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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.

Bond dissociation enthalpy. The order of increasing bond dissociation enthalpy is:
F-F<H-H<D-D
Reason: Since D has a smaller size than H, therefore D-D bond has the highest bond dissociation enthalpy followed by H – H. On the other hand, F – F bond has minimum dissociation enthalpy because of repulsion between lone pairs of F and bond pair.

Hence the bond dissociation enthalpy increases in the order F-F<H-H<D-D

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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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