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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 ?

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Long Answer Type

107. What is understood by ‘Hydrogen economy.’

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Short Answer Type

108.
How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.

In metallic hydrides, hydrogen is absorbed as H^- atoms. Due to the inclusion of H atoms, the metal lattice distorts and expands and thus becomes less stable. On heating, metallic hydride decomposes to give hydrogen and very finely divided metal. The liberated hydrogen gas can be used as a fuel. Thus transition metals (eg Pd, Pt) or their alloys can be used as storage media and transport hydrogen to be used as a fuel. This is called hydrogen economy.

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