CBSE Guess > Papers > Important Questions > Class XII > 2010 > Chemistry > Chemistry By Kaushik
CBSE CLASS XII
Q. 1. Why enthalpy of chemisorptions higher than that of physisorptions?
Q. 2. The values of dissociation constant A and B are 1*10-12 & 6.2*10-6. Which complex will be more stable and why?
Q. 3. Why it is difficult to prepare pure amines by ammonolysis of alkyl halide?
Q. 4. Draw the structure of p-nitro-toluene.
Q. 5. Name a preservative used in cold drinks.
Q. 6. Why aniline forms meta-nitro-aniline on nitration?
Q. 7. Why are vitamin A & C essential for us?
Q. 8. Benzyl chloride is 10 halide but still follows SN1 mechanism. Why?
Q. 9. Explain Schottky defect?
Q. 10. An element with molar mass 2.7*10-2 kg/mol forms a cubic cell with edge length 405pm. If its density is 2.7*103 kg/m3, what is the nature of cubic unit cell?
Q. 11. Determine the amount of CaCl2 (73.5%) dissolved in 2.5L of water such that its osmotic pressure is 7.5 atm at 270C.
Q. 12. Predict the products of electrolysis in each of the following→
i) An aqueous solution of AgNO3 with Ag electrode.
ii)A dilute solution of H2SO4 using Pt electrode.
Q. 13. Discuss the shape and magnetic behavior of Fe(CO)5. (Fe=26)
Q. 14. Complete the following reactions→
- P4O10 + H2O →?
- P4 + KOH + H2O →?
- Cu + H2SO4(c) →?
- SF4 + H2O →?
Q. 15. Propose the mechanism for the following reaction→
CH3CHO + HCN + H+ → CH3-CH(OH)-CN.
Q. 16. Write short notes on→
- Wurtz reaction.
- Sandmeyer’s reaction.
Q. 17. Differentiate between the following→
- Thermoplastics and thermosetting polymers.
- Elastomers and Fibres.
Q. 18. Write the names of monomers→
- Buna-S
- Terylene
- Nylon-6
- Buna-N
Paper By Mr. Kaushik
Email Id : [email protected]
Ph No.: 9406830780
