Compared to alkaline earth metals,what do alkali metals exhibit?

$A$ metal $X$ on heating in a stream of nitrogen gives $Y$. $Y$ on reaction with ${H_2}O$ gives a colorless gas which,when passed through a $CuSO_4$ solution,gives a blue color. What is $Y$?

Which of the following pairs will produce the same products upon reaction with water?

$H_2$ gas is not produced in which of the following reactions?

In the presence of which of the following does magnesium continue to burn?

Which chloride does not exist as hydrate?