The correct order of electropositive nature of $Li$,$Na$ and $K$ is

Starting with sodium chloride,how would you proceed to prepare:
$(i)$ sodium metal
$(ii)$ sodium hydroxide
$(iii)$ sodium peroxide
$(iv)$ sodium carbonate?

Among alkali metals,which element do you expect to be least electronegative and why?

Which of the following statements is incorrect?

What is the formula of lithium imide?

$A$ 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 $Y$?