Chemistry Class-11: Chapter –9. Hydrogen Part – 4

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Question: 24

Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

(i) Chlorides of Ca and Mg in water

(ii) Sulphates of Ca and Mg in water

(iii) Hydrogen carbonates of Ca and Mg in water

(iv) Carbonates of alkali metals in water

Answer: (i), (ii)

Question: 25

Which of the following statements is correct?

(i) Elements of group 15 form electron deficient hydrides.

(ii) All elements of group 14 form electron precise hydrides.

(iii) Electron precise hydrides have tetrahedral geometries.

(iv) Electron rich hydrides can act as Lewis acids.

Answer: (ii), (iii)

Question: 26

Which of the following statements is correct?

(i) Hydrides of group 13 act as Lewis acids.

(ii) Hydrides of group 14 are electron deficient hydrides.

(iii) Hydrides of group 14 act as Lewis acids.

(iv) Hydrides of group 15 act as Lewis bases.

Answer: (i), (iv)

Question: 27

Which of the following statements is correct?

(i) Metallic hydrides are deficient of hydrogen.

(ii) Metallic hydrides conduct heat and electricity.

(iii) Ionic hydrides do not conduct electricity in solid state.

(iv) Ionic hydrides are very good conductors of electricity in solid state.

Answer: (i), (ii), (iii)

III. Short Answer Type

Question: 28.

How can production of hydrogen from water gas be increased by using water gas shift reaction?

Question: 29

What are metallic/interstitial hydrides? How do they differ from molecular hydrides?

Question: 30

Name the classes of hydrides to which , and belong.

Question: 31

If same mass of liquid water and a piece of ice is taken, then why is the density of ice less than that of liquid water?

Question: 32

Complete the following equations:

Question: 33

Give reasons:

(i) Lakes freeze from top towards bottom.

(ii) Ice floats on water.

Question: 34

What do you understand by the term ‘auto protolysis of water’? What is its significance?

Question: 35

Discuss briefly de-mineralization of water by ion exchange resin.

Question: 36

Molecular hydrides are classified as electron deficient, electron precise and electron rich compounds. Explain each type with two examples.

Question: 37

How is heavy water prepared? Compare its physical properties with those of ordinary water.

Question: 38

Write one chemical reaction for the preparation of .

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