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

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.

Mention some important uses of dihydrogen ?

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

Give reason for the fact that liquid hydrogen is used as a fuel.