Which of the following pairs will not produce $H_2$ gas?

The synonym for water gas when used in the production of methanol is:

Which of the following chemicals contains chlorine?

Identify the hydride which is not correctly matched with the example given in brackets?

Which of the following oxides cannot be reduced by hydrogen?

What do you understand by the term non-stoichiometric hydrides? Do you expect this type of hydrides to be formed by alkali metals? Justify your answer.