tag:blogger.com,1999:blog-68155389460966977962024-03-13T21:15:52.706-07:00Chemistry - Practice Sets for IIT JEE ChemistrySome practice questions in various chaptersKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.comBlogger253125tag:blogger.com,1999:blog-6815538946096697796.post-2932539707807033142009-10-10T21:28:00.000-07:002009-10-10T21:41:05.176-07:00IIT-JEE-Chemistry-Final Revision Set No.901. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is<br /><br /> (A) 3<br /><br /> (B) 4<br /><br /> (C) 5<br /><br /> (D) 6<br /><br />2.The correct statement(s) regarding defects in solids is(are)<br /><br />(A) Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion<br /><br />(B) Frenkel defect is a dislocation defect<br /><br />(C) Trapping of an electron in the lattice leads to the formation of F-center<br /><br />(D) Schottky defects have no effect on the physical properties of solids<br /><br /><br />Paragraph<br /><br />p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexcyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z.<br /><br />3. The compound X is<br /><br /> (A) NaNO3<br /><br /> (B) NaCl<br /><br /> (C) Na2SO4<br /><br /> (D) Na2S<br /><br />4. The compound Y is<br /><br /> (A) MgCI2<br /><br /> (B) FeCI2<br /><br /> (C) FeCI3<br /><br /> (D) ZnCI2<br /><br />5. The compound Z is<br /><br /> (A) Mg2[Fe(CN)6]<br /><br /> (B) Fe[Fe(CN)6]<br /><br /> (C) Fe4[Fe(CN)6]3<br /><br /> (D) K2Zn3[Fe(CN)6]2<br /><br /><br />Source JEE 2009 Paper 1KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-2954918605591867072009-10-10T21:19:00.000-07:002009-10-10T21:28:01.728-07:00IIT-JEE-Chemistry-Final Revision Set No.891. STATEMENT-1 : There is a natural asymmetry between converting work to heat and converting heat to work.<br /><br /> and<br /><br /> STATEMENT-2 : No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br /><br />Paragraph BASED QUESTIONS<br /><br />In hexagonal systems of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space-filling model of this structure, called hexagonal close-packed (HCP), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be 'r'.<br /><br />2. The number of atoms in this HCP unit cell is<br /><br /> (A) 4<br /><br /> (B) 6<br /><br /> (C) 12<br /><br /> (D) 17<br /><br />3. The volume of this HCP unit cell is<br /><br /> (A) 24 √2 r³<br /><br /> (B) 16 √2 r³<br /><br /> (C) 12 √2 r³<br /><br /> (D) 64/3√3 r³<br /><br />4. The empty space in this HCP unit cell is<br /><br /> (A) 74%<br /><br /> (B) 47.6%<br /><br /> (C) 32%<br /><br /> (D) 26%<br /><br />5. Identify the process used to extract the metal/compound from the given ore<br /><br />Roasting, Calcinations, Carbon reduction, Self reduction<br /><br /><br />PbS --> PbO<br /><br /> CaCO3 --> CaO <br /><br /> ZnS --> Zn <br /><br /> Cu2S --> Cu<br /> <br /><br />Source: IIT JEE 2008 paper 2KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-69735615432730531892009-10-10T21:14:00.000-07:002009-10-10T21:19:20.143-07:00IIT-JEE-Chemistry-Final Revision Set No.881. The IUPAC name of [Ni(NH3)4] [NiCI4] is<br /><br /> (A) Tetrachloronickel (II) - tetraamminenickel (II)<br /><br /> (B) Tetraamminenickel (II) - tetrachloronickel (II)<br /><br /> (C) Tetraamminenickel (II) - tetrachloronickelate (II)<br /><br /> (D) Tetrachloronickel (II) - tetraaminenickelate (0)<br /><br />2. STATEMENT-1 : Aniline on reaction with NaNO2/HCI at 0°C followed by coupling with β-naphthol gives a dark blue coloured precipitate.<br /><br /> and<br /><br /> STATEMENT-2 : The colour of the compound formed in the reaction of aniline with NaNO2/HCI at 0°C followed by coupling with b-naphthol is due to the extended conjugation.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />3. STATEMENT-1 : [Fe(H2O)5NO]SO4 is paramagnetic.<br /><br /> and<br /><br />STATEMENT-2 : The Fe in [Fe(H2O)5NO]SO4 has three unpaired electrons.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />4. STATEMENT-1 : The geometrical isomers of the complex [M(NH3)4CI2] are optically inactive.<br /><br /> and<br /><br /> STATEMENT-2 : both geometrical isomers of the complex [M(NH3)4CI2] possess axis of symmetry.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />5. Electrolysis of dilute aqueous NaCI solution was carried out by passing 10 milli ampere current. The time required to liberate 0.01 mol of H2 gas at the cathode is (1 Faraday = 96500 C mol<sup>-1</sup>)<br /><br /> (A) 9.65 × 10<sup>4</sup> sec<br /><br /> (B) 19.3 × 10<sup>4</sup> sec<br /><br /> (C) 28.95 × 10<sup>4</sup> sec<br /><br /> (D) 38.6 × 10<sup>4</sup> sec<br /><br /><br />Soucre iit jee paper 2 2008KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-42164563211756731162009-10-10T20:50:00.000-07:002009-10-10T21:14:31.541-07:00IIT-JEE-Chemistry-Final Revision Set No.871. STATEMENT-1 : Alkali metals dissolve in liquid ammonia to give blue solutions.<br /><br /> because<br /><br /> STATEMENT-2: Alkali metals in liquid ammonia give solvates species of the type [M(NH3)n]+ (M = alkali metals).<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />2. STATEMENT-1: Molecules that are not superimposable on their mirror images are chiral.<br /><br /> Because<br /><br /> STATEMENT-2: All chiral molecules have chiral centers.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br /><br />3. STATEMENT-1: Band gap is germanium is small.<br /><br /> Because<br /><br />STATEMENT-2: The energy spread of each germanium atomic energy level is infinitesimally small.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />source: 2007 JEE paper 2<br /><br />4. Among the following, the coloured compound is<br /><br /> (A) CuCI<br /><br /> (B) K3 [Cu(CN)4]<br /><br /> (C) CuF2<br /><br /> (D) [Cu(CH3CN)4]BF4<br /><br />5. Both [Ni(CO)4] and [Ni(CN)4]2- are diamagnetic. The hybridization of nickel in these complexes, respectively, are<br /><br /> (A) sp3, sp3<br /><br /> (B) sp3, dsp2<br /><br /> (C) dsp2, sp3<br /><br /> (D) dsp2, dsp3<br /><br /><br />source: 2008 JEE, Paper 2KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-7887940382785047652009-10-10T20:48:00.000-07:002009-10-10T20:50:54.203-07:00IIT-JEE-Chemistry-Final Revision Set No.861. The number of stereoisomers obtained by bromination of trans-2-butene is<br /><br /> (A) 1<br /><br /> (B) 2<br /><br /> (C) 3<br /><br /> (D) 4<br /><br /><br />2. A positron is emitted from 23Na11. The ratio of the atomic mass and atomic number of the resulting nuclide is<br /><br /> (A) 22/10<br /><br /> (B) 22/11<br /><br /> (C) 23/10<br /><br /> (D) 23/12<br /><br />3. For the process H2O(l), (1 bar, 373 K) → H2O(g) (1 bar, 373 K), the correct set of thermodynamic parameters is<br /><br /> (A) DG = 0, DS = +ve<br /><br /> (B) DG = 0, DS = -ve<br /><br /> (C) DG = +ve, DS = 0<br /><br /> (D) DG = -ve, DS = +ve<br /><br />4. Consider a reaction aG + bH → Products. When concentration of both of the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is<br /><br /> (A) 0<br /><br /> (B) 1<br /><br /> (C) 2<br /><br /> (D) 3<br /><br />STATEMENT-1: Glucose gives a reddish-brown precipitate with Fehling's solution.<br /><br /> Because<br /><br /> STATEMENT-2: Reaction of glucose with Fehling's solution gives CuO and gluconic acid.<br /><br />(A) Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br /> <br /><br /><br />Source: 2007 JEE paper 2KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-67588455295788030022009-10-10T20:45:00.000-07:002009-10-10T20:48:38.769-07:00IIT-JEE-Chemistry-Final Revision Set No.85A 4.0 molar aqueous solution of NaCI is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass: Na = 23, Hg = 200; 1 Faraday = 96500 coulombs).<br /><br />1. The total number of moles of chlorine gas evolved is<br /><br /> (A) 0.5<br /><br /> (B) 1.0<br /><br /> (C) 2.0<br /><br /> (D) 3.0<br /><br />2. If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is<br /><br /> (A) 200<br /><br /> (B) 225<br /><br /> (C) 400<br /><br /> (D) 446<br /><br />3. The total charge (coulombs required for complete electrolysis is<br /><br /> (A) 24125<br /><br /> (B) 48250<br /><br /> (C) 96500<br /><br /> (D) 19300<br />--------------------<br /><br />4. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is<br /><br /> (A) 3<br /><br /> (B) 4<br /><br /> (C) 5<br /><br /> (D) 6<br /><br />5. Among the following metal carbonyls, the C-O bond order is lowest in<br /><br /> (A) [Mn(CO)6]+<br /><br /> (B) [Fe(CO)5]<br /><br /> (C) [Cr(CO)6]<br /><br /> (D) [V(CO)6]-<br /><br />Source: 2007 JEE paper 2KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-10348208753950973182009-10-10T20:29:00.000-07:002009-10-10T20:45:34.592-07:00IIT-JEE-Chemistry-Final Revision Set No.841. The structure of XeO3 is<br /><br /> (A) linear<br /><br /> (B) planar<br /><br /> (C) pyramidal<br /><br /> (D) T-shaped<br /><br />2. XeF4 and XeF6 are expected to be<br /><br /> (A) oxidizing<br /><br /> (B) reducing<br /><br /> (C) unreactive<br /><br /> (D) strongly basic<br /><br />3. STATEMENT-1<br /><br />Micelles are formed by surfactant molecules above the critical miceller concentration (CMC).<br /><br />Because<br /><br />STATEMENT-2<br /><br />The conductivity of a solution having surfactant molecules decreases sharply at the CMC.<br /><br />(A) Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />4. p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid.<br /><br /> Because<br /><br /> STATEMENT-2<br /><br /> o-Hydroxybenzoic acid has intramolecular hydrogen bonding.<br /><br />(A) Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />5.<br /><br />Match the chemical substances in Column I with type of polymers/type of bonds in Column II.<br /><br /> <br /><br />Column I -------Column II<br /> <br /><br /> Cellulose -- Synthetic polymer<br /><br /> <br /> <br /><br /> Nylon-6, 6 -- Glycoside linkage<br /> <br /> <br /><br /> Protein-----Amide linkage<br /> <br /> <br /><br /> Sucrose---- Natural polymers<br /><br /><br /> Source: 2007 JEE paper 1KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-83532759189847179072009-10-10T20:26:00.000-07:002009-10-10T20:29:41.692-07:00IIT-JEE-Chemistry-Final Revision Set No.831. The percentage of p-character in the orbitals forming P-P bonds in P4 is<br /><br /> (A) 25 (B) 33<br /><br /> (C) 50 (D) 75<br /><br />2. When 20g of naphthoic acid (C11H8O2) is dissolved in 50 g of benzene (Kf = 1.72 K kg mol-1), a freezing point depression of 2K is observed. The van't Hoff factor (i) is---?<br /><br />3. STATEMENT-1<br /><br /> Boron always forms covalent bond<br /><br /> Because<br /><br /> STATEMENT-2<br /><br /> The small size of B3+ favours formation of covalent bond.<br /><br />(A) Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />4. STATEMENT-1<br /><br /> In water, orthoboric acid behaves as a weak monobasic acid.<br /><br /> Because<br /><br /> STATEMENT-2<br /><br /> In water, orthoboric acid acts as a proton donor.<br /><br />(A) Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.<br /><br />(B) Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.<br /><br />(C) Statement-1 is True, Statement-2 is False<br /><br />(D) Statement-1 is False, Statement-2 is True<br /><br />5. Argon is used in arc welding because of its<br /><br /> (A) low reactivity with metal<br /><br /> (B) ability to lower the melting point of metal<br /><br /> (C) flammability<br /><br /> (D) high calorific value<br /><br /><br />Source: JEE 2007 paper 1KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-56945000454051957332009-10-10T20:22:00.000-07:002009-10-10T20:26:35.764-07:00IIT-JEE-Chemistry-Final Revision Set No.821. Calculate velocity of electron in first Bohr orbit of hydrogen atom <br />(Given r = a0)<br />(b) Find de-Broglie wavelength of the electron in first Bohr orbit.<br />(c) Find the orbital angular momentum of 2p-orbital in terms of h/2π units.<br />(Source: Main JEE 2005)<br /><br />2. The species having bond order different from that in CO is<br /><br /> (A) NO-<br /><br /> (B) NO+<br /><br /> (C) CN-<br /><br /> (D) N2<br /><br />3. Among the following, the paramagnetic compound is<br /><br /> (A) Na2O2<br /><br /> (B) O3<br /><br /> (C) N2O<br /><br /> (D) KO2<br />4. Extraction of zinc from zinc blende is achieved by<br /><br /> (A) electrolytic reduction<br /><br /> (B) roasting followed by reduction with carbon<br /><br /> (C) roasting followed by reduction with another meal<br /><br /> (D) roasting followed by self-reduction<br /><br />5. The number of structural isomers for C6H14 is<br /><br /> (A) 3<br /><br /> (B) 4<br /><br /> (C) 5<br /><br /> (D) 6<br /><br /><br />Source: 2007 JEE paper 1KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-64723633528371224702009-10-10T20:14:00.000-07:002009-10-10T20:20:30.227-07:00IIT-JEE-Chemistry-Final Revision Set No.811. An element crystallizes in fcc lattice having edge length 400 pm. Calculate the maximum diameter of atom which can be placed in interstitial site without distorting the structure.<br /><br />2. Predict whether the following molecules are iso-structural or not. Justify your answer.<br /><br />(i) NMe3<br />(ii) N(SiMe3)3<br /><br />3. Write balanced chemical equation for developing a black and white photographic film.<br /><br />4. give reason why the solution of sodium thiosulphate on acidification turns milky white and give balance equation of this reaction.<br /><br />5. 2X(g) → 3Y(g) + 2Z(g)<br /><br /><br />Time in minutes-----------------0------100-----200<br /><br />Partial Pressure of X----------800-----400-----200<br />(in mm of Hg)<br /><br />Assuming ideal gas condition calculate<br /><br />1. Order of reaction<br />2. rate constant<br />3.Time taken for 75% completion<br />4. Total pressure when PP of X is 700 mm.<br /><br />Source Main 2006KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-5934254905807007822009-10-10T20:10:00.000-07:002009-10-10T20:14:18.030-07:00IIT-JEE-Chemistry-Final Revision Set No.801. When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm and changes volume from 1 litre to 3 litre. Find the final temperature of the gas in kelvin. <br /><br />2. Monomer A of a polymer of ozonolysis yields two moles of HCHO and one mole of CH3COCHO. <br />(a) Deduce the structure of A. <br /><br />3. Calculate the amount of calcium oxide required when it reacts with 852 g of P4O10.<br /><br />4. Write the structure of P4O10.<br /><br />5. An element crystallizes in fcc lattice having edge length 400 pm. Calculate the maximum diameter of atom which can be placed in interstitial site without distorting the structure.<br /><br /><br />Source: IIT JEE Mains 2005KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-36334725275649826022009-10-10T20:07:00.000-07:002009-10-10T20:10:02.531-07:00IIT-JEE-Chemistry-Final Revision Set No.791. The two forms of D-glucopyranose obtained from the solution of D-glucose are called :<br />(a) isomer<br />(b) anomer<br />(c) epimer<br />(d) enantiomer<br /><br /><br />2. The number of radial nodes of 3s, and 2p orbitals are respectively :<br />(a) 2, 0<br />(b) 0, 2<br />(c) 1, 2<br />(d) 2, 1<br /><br />3. A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange colour solution. The cation of metal nitrate is:<br />(a) Hg<sup>2+</sup><br />(b) Bi<sup>3+</sup><br />(c) Pb<sup>2+</sup><br />(d) Cu<sup>+</sup><br /><br />4. When phenyl magnesium bromide reacts with t-butanol, the product would be:<br />(a) benzene<br />(b) phenol<br />(c) t-butyl benzene<br />(d) t-butyl phenyl ether<br /><br />5. The best method to prepare cyclohexene from cyclohexanol is by using :<br />(a) conc. HCI + ZnCl2<br />(b) conc. H3PO4<br />(c) HBr<br />(d) conc. HCI<br /><br /><br /><br />Source: JEE screening 2005KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-31224296751994207622009-10-10T20:00:00.000-07:002009-10-10T20:07:20.368-07:00IIT-JEE-Chemistry-Final Revision Set No.781. In which of the following crystals alternate tetrahedral voids are occupied?<br />(a) NaCI<br />(b) ZnS<br />(c) CaF2<br />(d) Na2O<br /><br />2.The elevation in boiling point of a solution of 20.16 g of CuCl2 in 1 kg of water will be:<br />(Molecular weight of CuCl2 = 134.4 and Kb = 0.52 Kg K mol<sup>-1</sup>)<br />(a) 0.075 °C<br />(b) 0.150 °C<br />(c) 0.468 °C<br />(d) 0.234 °C<br /><br />3. Name of the structure of silicates in which three oxygen atoms of [SiO4]4– are shared is :<br />(a) pyrosilicate<br />(b) sheet silicate<br />(c) linear chain silicate<br />(d) three dimensional silicate<br /><br />4. Lyophilic sols are :<br />(a) irreversible sols<br />(b) they are prepared from inorganic compounds<br />(c) coagulated by adding electrolytes<br />(d) self-stabilizing<br /><br />5. Which pair of compounds is expected to show similar colour in aqueous medium?<br />(a) FeCI3 and CuCI2<br />(b) VOCI2 and CuCI2<br />(c) VOCI2 and FeCI2<br />(d) FeCI2 and MnCI2<br /><br />Source: Screening JEE 2005KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-33688481228266791512009-10-10T19:57:00.000-07:002009-10-10T20:00:44.758-07:00IIT-JEE-Chemistry-Final Revision Set No.771. How will you convert butan-2-one to propanoic acid?<br />(a) Tollen’s reagent<br />(b) Fehling solution<br />(c) NaOH/I2/H+<br />(d) NaOH/NaI/H+<br /><br />2. Which blue-liquid is obtained on reacting equimolar amounts of two gases (N and O) at –30°C?<br />(a) N2O<br />(b) N2O3<br />(c) N2O4<br />(d) N2O5<br /><br />3. Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable?<br />(a) CH2—CH=CH—CH=O—CH3<br />(b) CH2=CH2—CH—CH=O—CH3<br />(c) CH2—CH—CH=CH—O—CH3<br />(d) CH2=CH—CH—CH—O—CH3<br /><br />4. The ratio of the rate of diffusion of helium and methane under identical condition of pressure and temperature will be:<br />(a) 4<br />(b) 2<br />(c) 1<br />(d) 0.5<br /><br />5. When PbO2 reacts with conc. HNO3 the gas evolved is:<br />(a) NO2<br />(b) O2<br />(c) N2<br />(d) N2O<br /><br /><br />Source JEE screening 2005KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-81369703974995381232009-10-10T19:54:00.000-07:002009-10-10T19:57:23.921-07:00IIT-JEE-Chemistry-Final Revision Set No.761. Which species has the maximum number of lone pair of electrons on the central atom? <br />(a) [ClO3-] <br />(b) XeF4 <br />(c) SF4 <br />(d) [I3-] <br /><br />2. Which kinds of isomerism is exhibited by octahedral Co(NH3)4 Br2CI? <br />(a) Geometrical and ionization <br />(b) Geometrical and optical <br />(c) Optical and ionization <br />(d) Geometrical only <br /><br />3. Which ore contains both Iron and Copper?<br />(a) Cuprite<br />(b) Chalcocite<br />(c) Chalcopyrite<br />(d) Malachite<br /><br />4. Which of the following is not oxidised by O3?<br />(a) KI<br />(b) FeSO4<br />(c) KMnO4<br />(d) K2MnO4<br /><br />5. Which one of the following statement for order of reaction is not correct?<br />(a) Order can be determined experimentally<br />(b) Order of reaction is equal to sum of the power of concentration terms in differential rate law<br />(c) It is not affected with stiochiometric coefficient of the reactants<br />(d) Order can not be fractional<br /><br />Source: Screening Jee 2005KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-11637993139178460722009-10-10T19:37:00.000-07:002009-10-10T19:41:56.658-07:00IIT-JEE-Chemistry-Final Revision Set No.751. 7-bromo-1, 3, 5-cycloheptatriene exists as ionic species in aqueous solution <br /> while 5-bromo-1, 3 cyclopentadiene doesn't ionize even in presence of <br /> Ag+ (aq). Explain. <br /><br />2. On the basis of ground state electronic configuration arrange the following <br /> molecules in increasing O-O bond length order.<br /><br /> KO2, O2, O2[AsF6] <br /><br />3. In the following equilibrium<br /><br /> N2O4(g) <--> 2NO2(g) <br /> When 5 moles of each are taken, the temperature is kept at 298 K the total <br /> pressure was found to be 20 bar. Given that<br /><br /> △Gf0(N2O4) = 100 kJ<br /><br /> △Gf0(NO2) = 50 kJ <br /><br /> (i) Find △G of the reaction <br /> (ii) The direction of the reaction in which the equilibrium shifts <br /><br />4. A1 and A2 are two ores of metal M. A1 on calcinations gives black precipitate, <br /> CO2 and water. Find A1<br /><br />5. An organic compound 'P' having the molecular formula C5H10O treated with <br /> dil H2SO4 gives two compounds, Q and R both gives positive idoform test.<br /> The reaction of C5H10O with dil H2SO4 gives reaction 10<sup>15</sup> times faster than<br /> ethylene. Identify organic compound of Q and R.<br /><br />Source Main 2004 JEEKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-4289708300136567592009-10-10T19:34:00.000-07:002009-10-10T19:37:20.072-07:00IIT-JEE-Chemistry-Final Revision Set No.741. Give the reaction of L-Glucose with Tollen's reagent. <br /><br /><br />2.Draw Newmann's projection the less stable staggered form of <br /> butane.<br />3. Arrange the following oxides in the increasing order of Bronsted basicity.<br /><br /> CI2O7, BaO, SO3, CO2, B2O3 <br />4. The crystal AB (rock salt structure) has molecular weight 6.023 y amu. <br /> Where y is an arbitrary number in amu. If the minimum distance between <br /> cation and anion is y<sup>1/3</sup> nm and the observed density is 20 kg/m<sup>3</sup>. Find the:<br /> <br /> (a) density in kg/m<sup>3</sup> and <br /> (b) type of defect <br /><br />Source 2004 main JEEKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-63204190773688473502009-10-10T19:29:00.000-07:002009-10-10T19:34:20.255-07:00IIT-JEE-Chemistry-Final Revision Set No.731. Number of lone pair (s) in XeF4 is/are <br /> (a) 0 <br /> (b) 1 <br /> (c) 2 <br /> (d) 3 <br /> <br />2. 0.004 M Na2SO4 is isotonic with 0.01 M glucose. Degree of dissociation of<br /> Na2SO4 is <br /><br /> (a) 75% <br /> (b) 50% <br /> (c) 25% <br /> (d) 85% <br /><br />3. 100 mL of a liquid contained in an insulated container at a pressure of 1 bar.<br /> The pressure is steeply increased to 100 bar. The volume of the liquid is <br /> decreased by 1 mL at this constant pressure. Find the DH and DU. <br /><br />4. Draw the shape of XeF4 according to VSEPR theory. Show the lone <br /> pair of electrons on the central atom. <br /><br />5. Draw the shape of OSF4 according to VSEPR theory. Show the lone <br /> pair of electrons on the central atom. <br /><br />Source<br />1,2 screening 2004<br />3,4,5 main 2004 JEEKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-69060507779383069492009-10-10T19:28:00.000-07:002009-10-10T19:29:49.001-07:00IIT-JEE-Chemistry-Final Revision Set No.721. 2 mol of an ideal gas expanded isothermally and reversibly from 1litre to 10 <br /> litres at 300 K. What is the enthalpy change?<br /><br /> (a) 4.98 kJ <br /> (b) 11.47 kJ <br /> (c) -11.47 kJ <br /> (d) 0 kJ <br />2. 2-hexyne gives trans-2-hexene on treatment with <br /><br /> (a) Li/NH3 <br /> (b) Pd/BaSO4 <br /> (c) LiAIH4 <br /> (d) Pt/H2 <br /> 3. How many chiral compounds are possible on mono chlorination of 2-methyl<br /> butane? <br /> (a) 2 <br /> (b) 4 <br /> (c) 6 <br /> (d) 8 <br /><br />4. Which of the following pairs give positive Tollen's test? <br /> (a) Glucose, sucrose <br /> (b) Glucose, fructose <br /> (c) Hexanal, acetophenone <br /> (d) Fructose, sucrose <br /><br />5. Which of the following as -O-O- linkage <br /> (a) H2S2O6 <br /> (b) H2S2O8 <br /> (c) H2S2O3 <br /> (d) H2S5O6 <br /><br />source JEE 200 screeningKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-60942264192715588042009-10-10T19:24:00.000-07:002009-10-10T19:28:00.384-07:00IIT-JEE-Chemistry-Final Revision Set No.711. Spontaneous adsorption of a gas on solid surface is an exothermic process <br /> because: <br /> <br /> (a) DH increases for system <br /> (b) DS increases for gas <br /> (c) DS decreases for gas <br /> (d) DG increases for gas <br /><br />2. Spin only magnetic moment of the compound Hg[Co(SCN)4] is <br /><br /> (a) √3 <br /> (b) √15 <br /> (c) √24 <br /> (d) √8 <br /><br />3. Which hydrogen like species will have same radius as that of Bohr orbit of <br /> hydrogen atom? <br /><br /> (a) n = 2, Li+2 <br /> (b) n = 2, Be3+ <br /> (c) n = 2, He+ <br /> (d) n = 3, Li2+ <br /><br />4. A sodium salt of an unknown anion when treated with MgCI2 gives white <br /> precipitate only on boiling. The anion is <br /><br /> (a) S<sub>4</sub>2- <br /> (b) HC<sub>3</sub>- <br /> (c) C<sub>3</sub><sup>2-</sup> <br /> (d) N<sub>3</sub>- <br /><br />5. 0.004 M Na2SO4 is isotonic with 0.01 M glucose. Degree of dissociation of<br /> Na2SO4 is <br /><br /> (a) 75% <br /> (b) 50% <br /> (c) 25% <br /> (d) 85%KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-73540381989841721592009-10-10T19:16:00.000-07:002009-10-10T19:23:48.698-07:00IIT-JEE-Chemistry-Final Revision Set No.701. 2-phenyl propene on acidic hydration gives <br /><br /> (a) 2-phenyl-2-propanol <br /> (b) 2-phenyl-1-propanol <br /> (c) 3-phenyl-1-propanol <br /> (d) 1-phenyl-2-propanol <br /><br />2. The methods chiefly used for the extraction of lead and tin from their ores <br /> are respectively<br /><br /> (a) Self reduction and carbon reduction <br /> (b) Self reduction and electrolytic reduction <br /> (c) Carbon reduction and self reduction <br /> (d) Cyanide process and carbon reduction <br /><br />3. Benzamide on treatment with POCl3 gives <br /><br /> (a) Aniline <br /> (b) Benzonitrile <br /> (c) Chlorobenzene <br /> (d) Benzyl amine <br /><br />4. (NH4)2 Cr2O7 on heating gives a gas which is also given by <br /><br /> (a) Heating NH4NO2 <br /> (b) Heating NH4NO3 <br /> (c) Mg3N2 + H2O <br /> (d) Na(comp.) + H2O2 <br /><br />5. HX is a weak acid (K<sub>ap</sub> =5). It forms a salt NaX (0.1M) on reacting with caustic soda. The degree of hydrolysis of NaX is <br /> <br /> (a) 0.01 % <br /> (b) 0.001 % <br /> (c) 0.1 % <br /> (d) 0.15% <br /><br /><br /><br /><br />Source: JEE 2004 screeningKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-82224164718068230742009-10-10T08:43:00.000-07:002009-10-10T08:47:00.654-07:00IIT-JEE-Chemistry-Final Revision Set No.691. In the process of extraction of gold, <br /> Roasted gold ore + CN- + H2O → O2 → [X] + OH- <br /> [X] + Zn → [Y] + Au <br /> Identify the complexes [X] and [Y] : <br /> (a) X = [Au(CN)2]-, Y = [Zn(CN)4]2- <br /> (b) X = [Au(CN)4]3-, Y = [Zn(CN)4]2- <br /> (c) X = [Au(CN)2]-, Y = [Zn(CN)6]4- <br /> (d) X = [Au(CN)4]-, Y = [Zn(CN)4]2- <br /><br />2. Positive deviation from ideal behaviour takes place because of : <br /> (a) Molecular interaction between atom and PV/nRT > 1. <br /> (b) Molecular interaction between atom and PV/nRT is l.t. 1. <br /> (c) Finite size of atom and PV/nRT > 1 <br /> (d) Finite size of atoms and PV/nRT is l.t. 1 <br /><br />3. An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be: <br /> (a) Optically active mixture <br /> (b) Pure enantiomer <br /> (c) Meso Compound <br /> (d) Racemic mixture <br /><br />4. Calculate the molarity of water if its density is 1000 kg/m3. <br /><br />5. The average velocity of gas molecules is 400 m/sec. Calculate its rms velocity at the same temperature.KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-82702646916532661672009-10-10T08:36:00.000-07:002009-10-10T08:42:56.244-07:00IIT-JEE-Chemistry-Final Revision Set No.681. In the electrolytic cell, flow of electrons is from : <br /> (a) cathode to anode in solution <br /> (b) cathode to anode through external supply <br /> (c) cathode to anode through internal supply <br /> (d) anode to cathode through internal supply <br />2. In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 is 2 × 10<sup>4</sup> sec. The rate constant of reaction in sec-1 is : <br /> (a) 2 × 10<sup>4</sup> <br /> (b) 3.45 × 10<sup>-5</sup> <br /> (c) 1.386 × 10<sup>-5</sup> <br /> (d) 2 × 10<sup>-4</sup><br /><br />3. During depression of freezing point in a solution the following are in equilibrium : <br /> (a) liquid solvent, solid solvent <br /> (b) liquid solvent, solid solute <br /> (c) liquid solute, solid solute <br /> (d) liquid solute solid solvent <br /><br />4. H3BO3 is : <br /> (a) Monobasic and weak Lewis acid <br /> (b) Monobasic and weak Bronsted acid <br /> (c) Monobasic and strong Lewis acid <br /> (d) Tribasic and weak Bronsted acid <br /><br />5. <sup>23</sup>Na is the more stable isotope of Na. Find out the process by which <sup>24</sup>Na can undergo radioactive decay: <br /> (a) b- emission <br /> (b) a emission <br /> (c) b+ emission <br /> (d) K electron capture <br /><br /><br />Screening JEE 2003KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-24020537179281170652009-10-10T08:31:00.000-07:002009-10-10T08:36:42.699-07:00IIT-JEE-Chemistry-Final Revision Set No.671. Among the following the molecule with the highest dipole moment is : <br /> (a) CH3CI <br /> (b) CH2CI2 <br /> (c) CHCI3 <br /> (d) CCI4 <br /><br />2. For H3PO3 and H3PO4 the correct choice is: <br /> (a) H3PO3 is dibasic and reducing <br /> (b) H3PO3 is dibasic and non-reducing <br /> (c) H3PO4 is tribasic and reducing <br /> (d) H3PO3 is tribasic and non-reducing <br /><br />3. When MnO2 is fused with KOH, a coloured compound is formed, the product and its colour is : <br /> (a) K2MnO4, purple green <br /> (b) KMnO4, purple <br /> (c) Mn2O3, brown <br /> (d) Mn3O4 black <br />4. Rate of physiorption increases with : <br /> (a) decrease in temperature <br /> (b) increase in temperature <br /> (c) decrease in pressure <br /> (d) decrease in surface area <br /><br />5. Which has maximum number of atoms? <br /> (a) 24g of C <br /> (b) 56 g of Fe <br /> (c) 27g of Al <br /> (d) 108 g of AgKVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0tag:blogger.com,1999:blog-6815538946096697796.post-57194741839270177692009-10-10T08:25:00.000-07:002009-10-10T08:31:33.314-07:00IIT-JEE-Chemistry-Final Revision Set No.661. How is boron obtained from borax? Give chemical equations with reaction conditions.<br /><br />2. When a white crystalline compound X is heated with K2Cr2O7 and concentrated H2SO4 a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow coloured solution of B is obtained. Neutralizing the solution of B with acetic acid and on subsequent addition of lead acetate a yellow precipitate C is obtained. When X is heated with NaOH solution, a colourless has is evolved and on passing this gas into K2HgI4 solution, a reddish brown precipitate D is formed. Identify A, B, C, D and X. <br /><br />3. A biologically active compound, Bombykol (C<sub>16</sub>H<sub>30</sub>O) is obtained from a natural source. The structure of the compound is determine by the following reactions. <br />(a) On hydrogenation, Bombykol gives a compound A, C<sub>16</sub>H<sub>34</sub>O, which reacts with acetic anhydride to give an ester, <br />(b) Bombykol also reacts with acetic hydride to give another ester, which on oxidative ozonolysis (O3/H2O2) gives a mixture of butanoic acid, oxalic acid and 10-acetoxy decanoic acid. <br />Determine the number of double bonds in Bombykol.<br /><br />4. Two moles of a perfect gas undergo the following processes: <br />(a) a reversible isobaric expansion from (1.0 atm, 20.0 L) to (1.0 atm, 40.0 L); <br />(b) a reversible isochoric change state from (1.0 atm, 40.0 L) to (0.5 atm, 40.0 L); <br />(c) a reversible isothermal compression from (0.5 atm, 40.0 L) to (1.0 atm, 20.0 L); <br /><br />(ii) Calculate the total work (w) and the total heat change (q) involved in the above processes.KVSSNraohttp://www.blogger.com/profile/05748254811752425330noreply@blogger.com0