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Hydrogen

Short Answer Type

101. Arrange the following:
LiH, NaH and CsH in order of increasing ionic character.

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102. Arrange the following:
H–H, D–D and F–F in order of increasing bond dissociation enthalpy.

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103. Arrange the following:

NaH, MgH₂ and H₂O in order of increasing reducing property.

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Long Answer Type

104.

Describe the industrial uses of hydrogen which depend on:
(i) the heat liberated when it burns,
(ii) its ability to react with vegetable oil in the presence of catalyst,
(iii) its ability to unite with nitrogen.

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Short Answer Type

105. How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

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106.
Mention some important uses of dihydrogen ?

It is used:
(i) in filling toy balloons and airships.
(ii) in the hydrogenation of oils to get vanaspati ghee.
(iii) in the manufacture of ammonia, methyl alcohol, water gas and fertilisers.
(iv) in oxy-hydrogen torch for welding purposes
(v) as a reducing agent in laboratory and industry.

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