Very short answer type questions- Chemistry Class XII

12/15/2014 CBSE

Q1. What is difference between a sol and a gel?

Q2. For the assumed reaction, X2 + 2Y2
write the rate equation in terms of the rate of disappearance of Y2?

Q3. Name the Xenon fluorides molecule is iso-structural
with IF5 Draw the structure of its molecules?

Q4. What does the prefix η2 in PtCl3
2- C2H4) mean?

Q5. Pick odd out of them Equanil, Seconal, Luminal,

Q6. Why are carbohydrates optically active?

Q7. Gold crystallizes in FCC arrangement. The edge length
is 40.70 nm. Calculate the radius of gold atom?

Q8. What happens when a solution of NaCl is added to Fe(OH)3
sol explain? Write whether Fe(OH)3 sol is a multi-molecular
colloid or macro-molecular colloid?

Q9. Describe the principle of each of the following process

a) Mond�s Process

b) Zone refining

Q10. Complete and balance the following equations:

a) NH3 + NaOCl

b) SCl2 + NaF

Q11. Write monomers, polymers with structures and their uses
for the following polymers:

a) Poly Acrylonitrile (PAN)

b) Poly styrene

Q12. Define the following and give one example of each:

a) F-centre

b) Ionization isomerism in co-ordination compounds

Q13. With the help of suitable diagrams explain negative
deviation from Raoult�s Law also give two examples for the deviation?

Q14. Explain the following giving reasons:

a) Electrolysis of aqueous solution of NaCI gives H2
at cathode and Cl2 gas at anode

b) Electrolysis of aqueous solution of CuBr2
gives Cu at cathode and Br2 at the anode.

Q15. Explain the following observations that tetrahedral Ni
(II) complexes are paramagnetic but square planar Ni (II) complexes are di-magnetic?

Q16. Give two examples of artificial sweeteners. What are
their advantages over natural sweeteners?


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