1. Arrange the following compounds in increasing order of dipole moment, toluene (I), o-dichlorobenzene (II), m-dichlorobenzene (III) and p-dichlorobenzene (IV).
Ans. IV < I < III < II

2. Arrange CN, CN+ and CNñ
in increasing order of relative stabilities.
Ans. CNñ > CN > CN+

3. In which solvent NaCl has maximum solubility ?
Ans. H2O

4. Indicate wether glycine (NH2 ñ CH2 ñ COOH) is an acid or a base or both.
Ans. Both (Since in this -NH2
is basic and -COOH is acidic)

5. A reaction between AlCl3 and NH3
is called -
Ans. Neutralisation

6. Which metal is not found in meteorites ?
Ans. Ag, Au

7. What is use of Hall-Heroult cell ?
Ans. Purification of aluminium.

8. What is the difference between corundum and carborundum ?
Ans. Corundum isAl2O3 and carborundum is SiC.

9. In which climate tin cannot be used as structural metal ?
Ans. In cold climate because in cold climate tin becomes brittle.

10. Oxide of which metal is used in sun screen ?
Ans. ZnO

11. What is the chemical formula of foolís gold ?
Ans. FeS2

12. When an impurity in metal has greater affinity for oxygen and is more easily oxidised than the metal itself,
then which process is used to refine the metal ?
Ans. Cupellation

13. Which compounds act as propellant for rockets ?
Ans. Liquid hydrogen + Liquid oxygen

14. A substance X is a compound of an element of group IA. The substance X gives violet colour in flame test, X is :
Ans. KCl

15. Why is Na2S2O3
. 5H2O used in photography ?
Ans. To remove decomposedAgBr as a soluble complex

16. Zinc gives H2 gas with conc. H2SO4 and conc. HCl but not with conc. HNO3
. Why ?
Ans. NO3ñ
ion is reduced to NO2
in prefercence to H3O+ ( hydronium) ion.

17. Acompound of mercury which used in cosmetics, inAyurvedic and Yunani medicnes and known as Vermil
lion.s
Ans. HgS

18. ëBordeaux mixtureí is used as fungicide. Write its composition. Ans. CuSO4 + Ca(OH)
2 19. Name the metals present in insulin, haemoglobin and vitamin B12 respectively. Ans. Zn, Fe, Co