#### Hydrogen Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Water gas is

(a)

H2O(g)

(b)

CO + H2O

(c)

CO + H2

(d)

CO + N2

2. If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

(a)

1.2 g

(b)

2.4 g

(c)

3.6 g

(d)

$\sqrt{4.8}$g

3. The cause of permanent hardness of water is due to

(a)

Ca(HCO3)2

(b)

Mg(HCO3)2

(c)

CaCl2

(d)

MgCO3

4. Deuterium consist of _____________

(a)

one electron, two proton, three neutron

(b)

one electron, one proton, one neutron

(c)

two electron, one proton, one neutron

(d)

three electron, two proton, one neutron

5. The radioactive isotope of hydrogen is __________

(a)

protium

(b)

deuterium

(c)

tritium

(d)

nascent hydrogen

6. 5 x 2 = 10
7. Discuss the three types of Covalent hydrides.

8. NH3 has exceptionally high melting point and boiling point as compared to those of the hydrides of the remaining element of group 15. Explain.

9. Why interstitial hydrides have a lower density than the parent metal.

10. How is tritium prepared?

11. How is deuterium prepared from heavy water?

12. 5 x 3 = 15
13. Give the uses of heavy water,

14. Explain the exchange reactions of deuterium.

15. Mention the uses of deuterium.

16. Water is a useful solvent. Which properties make water as a good solvent?

17. List out the properties· that allow water to play a key role in the biosphere.

18. 4 x 5 = 20
19. Explain preparation of hydrogen using electrolysis.

20. Compare the structures of H2O and H2O2 .

21. Conc. H2SO4 cannot be used for drying hydrogen gas. Why?

22. Write a note on application of hydrogen in cutting and welding purpose.