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Hydrogen

Long Answer Type

71.

What is water gas? How will you prepare hydrogen from water gas?
Or
How is dihydrogen prepared on a commercial scale?

120 Views

Short Answer Type

72. What do you understand by the term syngas?

474 Views

73.

How can the production of dihydrogen, obtained from 'coal gasification' be increased?

331 Views

74.

What do you understand by the term:
water-gas shift reaction.

878 Views

75.

How will you prepare hydrogen commercially from hydrocarbons?
Or
What is understood by ‘water gas shift reaction’? Discuss its use for the preparation of hydrogen.

113 Views

76.

Describe the bulk preparation of hydrogen by an electrolytic method. What is the role of electrolyte in this process?
Or
How is dihydrogen manufactured by the electrolysis of water?

393 Views

77.

How is dihydrogen manufactured by Lane's process?

597 Views

78.

How would you prepare heavy hydrogen in laboratory?

162 Views

79. Discuss the consequences of high enthalpy of H – H bond in terms of chemical reactivity of dihydrogen.

255 Views

Long Answer Type

80.
How does dihydrogen react with:
(a) non-metals (b) metals and (c) metal oxides?

(a)Reaction of dihydrogen with non-metals:

(i) With halogens: Dihydrogen forms hydrogen halides with halogens. With fluorine, the reaction is very violent and the reactivity decreases in the order Cl₂, Br₂ and I₂.

(ii) When nitrogen: When a mixture of dihydrogen and dinitrogen under pressure is passed over finely divided iron containing traces of molybdenum at 673K, it produces ammonia.

(iii) With oxygen: Dihydrogen combines with oxygen either at 970 K or by passing electric spark into the gaseous mixture to form water vapours.

(iv) With sulphur: When dihydrogen is bubbled through molten sulphur at 700 K, hydrogen sulphide is produced.

(v) With carbon: Dihydrogen combines with carbon to form methane or acetylene depending upon the condition of the reaction.

(b) The combination with metals (Dihydrogen acts as an oxidising agent): Dihydrogen combines with metals like sodium, potassium and calcium upon heating to from corresponding hydrides.

These hydrides are of ionic nature (salt-like). In the above reactions, hydrogen acts as an oxidising agent.

(c) Combination with metallic oxides(Dihydrogen acts as a reducing agent):
Dihydrogen reduces heated metal oxides to metals.