1. Is the complex [Ti(NO3)4] coloured?
2. Is the complex [Cr(NH3)6]3+3Cl- coloured?
3. Give reasons: Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water.
4. give reasons: Aryl halides are less reactive than alkyl halides towards nucleophilic reagents.
5. Sodium metal crystallises in body centred cubic lattice with the cell edge, a = 4.29 A0. What is the radius of sodium atom?
Source: JEE 1994 paper
Friday, October 2, 2009
Thursday, October 1, 2009
IIT JEE Final Revision Set 13
1. When a gas A is passed through dry KOH at low temperature, a deep red-coloured compound, B and gas C are obtained. The gas A on reaction with but-2-ene, followed by treatment with Zn/H2O yields acetaldehyde. Identify A, B and C.
2. Write the conversion process for converting benzene into 4-Nitrobenzaldehyde.
3. A 4:1 molar mixture of He and CH4 is contained in a vessel at 20 bar pressure. Due to a hole in the vessel the gas mixture leaks out. What is the composition of the mixture effusing out initially?
4. What is the number of waves made by a Bohr electron in one complete revolution in its third orbit?
5. t-butanol and n-butanol are separately treated with a few drops of dilute KMnO4. In one case, the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction?
Source: 1994 JEE paper
2. Write the conversion process for converting benzene into 4-Nitrobenzaldehyde.
3. A 4:1 molar mixture of He and CH4 is contained in a vessel at 20 bar pressure. Due to a hole in the vessel the gas mixture leaks out. What is the composition of the mixture effusing out initially?
4. What is the number of waves made by a Bohr electron in one complete revolution in its third orbit?
5. t-butanol and n-butanol are separately treated with a few drops of dilute KMnO4. In one case, the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction?
Source: 1994 JEE paper
IIT JEE Final Revision Set 12
1. At temperature, T, a compound AB2(g) dissociates according to the reaction
2AB2(g)↔ 2AB(g) + B2(g)with a degree of dissociation x, which is small in compared with unity. What is the expression for x in terms of the equilibrium constant, Kp and the total pressure P.
2. For the reaction [Ag(CN)2]- ↔ Ag+ +2CN-, the equilibrium constant at 25°C is 4.0×10-19. Find the silver ion concentration in a solution which was originally 0.10 molar in KCN and 0.03 molar in AgNO3.
3. According to VSEPR theory, what is the type of hybridization in OF2?
4. The composition of a sample of wustite is Fe0.93O1.00. What percentage of the iron is present in the form of Fe(III)?
5. A is a binary compound of a univalent metal. 1.422 g of A reacts completely with 0.321 g of sulphur in an evacuated and sealed tube to give 1.743 g of a white crystalline solid B that forms a hydrated double salt, C with Al2(SO4)3. Identify A,B and C.
(Source: 1994 JEE Question Paper)
2AB2(g)↔ 2AB(g) + B2(g)with a degree of dissociation x, which is small in compared with unity. What is the expression for x in terms of the equilibrium constant, Kp and the total pressure P.
2. For the reaction [Ag(CN)2]- ↔ Ag+ +2CN-, the equilibrium constant at 25°C is 4.0×10-19. Find the silver ion concentration in a solution which was originally 0.10 molar in KCN and 0.03 molar in AgNO3.
3. According to VSEPR theory, what is the type of hybridization in OF2?
4. The composition of a sample of wustite is Fe0.93O1.00. What percentage of the iron is present in the form of Fe(III)?
5. A is a binary compound of a univalent metal. 1.422 g of A reacts completely with 0.321 g of sulphur in an evacuated and sealed tube to give 1.743 g of a white crystalline solid B that forms a hydrated double salt, C with Al2(SO4)3. Identify A,B and C.
(Source: 1994 JEE Question Paper)
Saturday, September 26, 2009
JEE Chemistry Final Revision Set No. 11
1. 9.75 g of a substance when dissolved in 72.0 g of water, lowered its vapour pressure by 0.5 mm at a given temperature. The vapour pressure of water at this temperature is 25.0 mm. Calculate the molecular weight of solute.
2. Blood freezes at 272.44 K and a solution of 6.0 gm of Urea in 500 gm of water freezes at 272.63 K. Calculate osmotic pressure of blood at 310 K. (Assume density of blood at 310 K to be 1 g/cc).
3. Acetic acid in benzene forms a dimer. 1.65 gm of acetic acid when dissolved in 100 gm of benzene raised bte boiling point by 0.36°C. Calculate the Van't Hoff factor.
(kb for benzene = 2.57°C/m).
4. The heat of formation of ethane is -19.46 kcal. Bond energies of C-C, C-H and H-H are 80.0, 99.0 and 104.18kcal respectively. Calculate the heat of atomisation of graphite. (Answer: 171 kcal).
5. The standard molar enthalpies of formation of cyclohexane (liquid) and benzene(liquid) at 25°C are -156 and +49 kJ/mol respectivley. The standard enthalpy of hydrogenation of cyclohexane (liquid) at 25°C is -119 kJ/mol. Use these data to estimate the magnitude of the resonance energy of benzene. (Answer: -152 kJ/mol)
2. Blood freezes at 272.44 K and a solution of 6.0 gm of Urea in 500 gm of water freezes at 272.63 K. Calculate osmotic pressure of blood at 310 K. (Assume density of blood at 310 K to be 1 g/cc).
3. Acetic acid in benzene forms a dimer. 1.65 gm of acetic acid when dissolved in 100 gm of benzene raised bte boiling point by 0.36°C. Calculate the Van't Hoff factor.
(kb for benzene = 2.57°C/m).
4. The heat of formation of ethane is -19.46 kcal. Bond energies of C-C, C-H and H-H are 80.0, 99.0 and 104.18kcal respectively. Calculate the heat of atomisation of graphite. (Answer: 171 kcal).
5. The standard molar enthalpies of formation of cyclohexane (liquid) and benzene(liquid) at 25°C are -156 and +49 kJ/mol respectivley. The standard enthalpy of hydrogenation of cyclohexane (liquid) at 25°C is -119 kJ/mol. Use these data to estimate the magnitude of the resonance energy of benzene. (Answer: -152 kJ/mol)
Thursday, September 10, 2009
IIT JEE Chemistry Final Revision Set No. 10
1. Calculate the equilibrium constant for the reaction,
2Fe3+ + 3I- ↔ 2Fe2+ + I3-.
The standard reduction potentials in acidic condition are 0.77 and 054 V respectively for Fe3+/Fe2+ and I3-/I- couples.
2. The hardest Boron Compound is
a. BN
b. B2O3
c. B4C
d. NaBO2
3. A solution of (+)-2-chloro-2-phenylethane in toluene racemizes slow in the presence small amount of ______________ due to the formation of ___________ .
4. CuCl has a similar structure as of Zinc blend and its structure density is 3.4 g/cm³. What is the length of unit cell edge?
a. 802pm
b. 578pm
c. 662pm
d. 678pm
5. Assertion-Reason type
Statement:For each ten degree rise of temperature the specific rate constant is nearly doubled.
Reason: Engery-wise distribution of molecules in a gas is an experimental function of temperature.
2Fe3+ + 3I- ↔ 2Fe2+ + I3-.
The standard reduction potentials in acidic condition are 0.77 and 054 V respectively for Fe3+/Fe2+ and I3-/I- couples.
2. The hardest Boron Compound is
a. BN
b. B2O3
c. B4C
d. NaBO2
3. A solution of (+)-2-chloro-2-phenylethane in toluene racemizes slow in the presence small amount of ______________ due to the formation of ___________ .
4. CuCl has a similar structure as of Zinc blend and its structure density is 3.4 g/cm³. What is the length of unit cell edge?
a. 802pm
b. 578pm
c. 662pm
d. 678pm
5. Assertion-Reason type
Statement:For each ten degree rise of temperature the specific rate constant is nearly doubled.
Reason: Engery-wise distribution of molecules in a gas is an experimental function of temperature.
IIT JEE Chemistry Final Revision Set No. 9
1. A first order reaction is 50% complete in 30 minutes at 27°C and in 10 minutes at 47°C. Calculate the reaction rate constant at 27°C and the energy of activation of the reaction in kJ/mole.
2. Assertion Reason Type
Statement : The order of reaction cannot have a fractional value.
Reason: For an elementary reaction, the partial orders are determined by the reaction stoichiometry.
3. An element crystallises in a structure having fcc unit cell of an edge 200pm. What is the density if 200g of it contains 24×1023 atoms?
a. 43.6 g
b. 44.6 g
c. 42.6 g
d. 41.6 g
4. Give the steps for converting Ethylbenzene to 2-phenylpropionic acid.
5. the standard reduction potential of the Ag+/Ag electrode at 298K is 0.799 V. Given that for AgI, Ksp = 8.7×10-17, evaluate the potential of the Ag+/Ag electrode in a saturaded solution of AgI.
2. Assertion Reason Type
Statement : The order of reaction cannot have a fractional value.
Reason: For an elementary reaction, the partial orders are determined by the reaction stoichiometry.
3. An element crystallises in a structure having fcc unit cell of an edge 200pm. What is the density if 200g of it contains 24×1023 atoms?
a. 43.6 g
b. 44.6 g
c. 42.6 g
d. 41.6 g
4. Give the steps for converting Ethylbenzene to 2-phenylpropionic acid.
5. the standard reduction potential of the Ag+/Ag electrode at 298K is 0.799 V. Given that for AgI, Ksp = 8.7×10-17, evaluate the potential of the Ag+/Ag electrode in a saturaded solution of AgI.
Tuesday, September 8, 2009
IIT JEE Chemistry Final Revision Set 8
1. The amount of glucose obtained by the hydrolysis of one mole maltose is _____ .
2. State true or false.
The movement of the dispersed phase towards one of the electrodes of an electric field is called cataphoresis.
3. The standard reductin potential for Cu2+/Cu is 0.34V. Calculate the reduction potential at pH = 14 for the above couple.
Take Ksp of Cu(OH) as 1×10-19
4. A current of 3.7 A is passed for 6 hrs. between Ni electrodes in 0.5L of 2M solution of Ni(NO3)2. What is the molarity of solution at the end of eletrolysis.
5. State whether the following statements are true or false.
In the case of nitration of arenes
(i). All activating sustituents are ortho, para directors.
(ii) Halogen substituents ae slightly deactivating but or ortho, para-directing.
(iii) Strongly deactivating substituents are meta directors.
2. State true or false.
The movement of the dispersed phase towards one of the electrodes of an electric field is called cataphoresis.
3. The standard reductin potential for Cu2+/Cu is 0.34V. Calculate the reduction potential at pH = 14 for the above couple.
Take Ksp of Cu(OH) as 1×10-19
4. A current of 3.7 A is passed for 6 hrs. between Ni electrodes in 0.5L of 2M solution of Ni(NO3)2. What is the molarity of solution at the end of eletrolysis.
5. State whether the following statements are true or false.
In the case of nitration of arenes
(i). All activating sustituents are ortho, para directors.
(ii) Halogen substituents ae slightly deactivating but or ortho, para-directing.
(iii) Strongly deactivating substituents are meta directors.
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