IIT-JEE-Chemistry-Final Revision Set No.54

1. In thermodynamics, a process is called reversible when:
(a) Surroundings and system change into each other
(b) There is no boundary between system and surroundings
(c) The surroundings are always in equilibrium with the system
(d) The system changes into the surroundings spontaneously

2. In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is:
(a) AB2
(b) A2B
(c) A4B3
(d) A3B4

3. 1-Propanol and 2-Propanol can be best distinguished by :
(a) Oxidation with alkaline KMnO4 followed by reaction with Fehling solution
(b) Oxidation with acidic dichromate followed by reaction with Fehling solution
(c) Oxidation by heating with copper followed by reaction with Fehling solution
(d) Oxidation with concentrated H2SO4 followed by reaction with Fehling solution

4. An SN2 reaction at an asymmetric carbon of a compound always gives :
(a) An enantiomer of the substrate
(b) A product with opposite optical rotation
(c) A mixture of diastereomers
(d) A single steroisomer

5. The quantum numbers +1/2 and -1/2 for the electron spin represent :
(a) Rotation of the electron in clockwise and anticlockwise direction respectively
(b) Rotation of the electron in anticlockwise and clockwise direction respectively
(c) Magnetic moment of the electron pointing up and down respectively
(d) Two quantum mechanical spin states which have no classical analogue

Source JEE 2001 screening