#### Hydrogen Book Back Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
5 x 1 = 5
1. Which of the following statements about hydrogen is incorrect?

(a)

Hydrogen ion, H3O+ exists freely in solution.

(b)

Dihydrogen acts as a reducing agent.

(c)

Hydrogen has three isotopes of which tritium is the most common.

(d)

Hydrogen never acts. as cation in ionic salts

2. Tritium nucleus contains

(a)

1 p+0 n

(b)

2 p+1 n

(c)

1 p + 2 n

(d)

none of these

3. The hardness of water can be determined by volumetrically using the reagent

(a)

sodium thio sulphate

(b)

potassium permanganate

(c)

hydrogen peroxide

(d)

EDTA

4. Zeolite used to soften hardness of water is hydrated

(a)

Sodium aluminium silicate

(b)

Calcium aluminium silicate

(c)

Zinc aluminium borate

(d)

Lithium aluminium hydride

5. For decolorisation of 1 mole of acidified KMnO4, the moles of H2O2 required is

(a)

$\frac{1}{2}$

(b)

$\frac{3}{2}$

(c)

$\frac{5}{2}$

(d)

$\frac{7}{2}$

6. 3 x 2 = 6
7. Explain why hydrogen is not placed with the halogen in the periodic table.

8. Predict which of the following hydrides is a gas on a solid (a) BCI (b) NaH. Give your reason.

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

10. 3 x 3 = 9
11. Hydrogen peroxide can function as an oxidising agent as well as reducing agent. substantiate this statement with suitable examples.

12. Explain the exchange reactions of deuterium.

13. Arrange NH3, H2O and HF in the order of increasing magnitude of hydrogen bonding and explain the basis for your arrangement.

14. 2 x 5 = 10
15. Justify the position of hydrogen in the periodic table?

16. An isotope of hydrogen (A) reacts with diatomic molecule of element which occupies group number 16 and period number 2 to give compound (B) is used as a moderator in nuclear reaction. (A) adds on to a compound ( C), which has the molecular formula C3H6 to give (D). Identify A, B, C and D.