1. Ammonia gas can be dried by

2. Dry ice is

3. When excess of Kl is added to copper sulphate solution:

4. Which of the following is the hardest substance known?

5. In the compound of type ECl₃, where E = B, P, As, or Bi, the angle Cl – E – Cl for different E are ion the order:

6. On heating ozone, its volume.

7. If Cl₂ gas is passed in to aqueous solution of Kl containing some CCl₄ and the mixture is shaken then:

8. The element which exists in a liquid state for a wide range of temperatures and can be used for measuring high temperature is

9. Inert gases such as helium behave like ideal gases over a wide range of temperature .However; they condense into the solid state at very low temperatures. It indicates that at very low temperature there is a

10. Which of the following has least covalent P−H bond?

11. In general, the Boron Trihaides act as

12. Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

13. Red phosphorus is chemically less reactive because

14. Boric acid is polymeric due to

15. Thermodynamically the most stable form of carbon is

16. Boric acid is an acid because its molecule

17. Which of the following statements regarding ozone is not correct?

18. From B₂H₆ all the following can be prepared except

19. Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order:

20. Orthoboric acid when heated to red heat gives