The reason why alkali metals impart color to the Bunsen burner flame is ......

$A$ compound $(M_2O_2)$ of group $I$ element $(M)$ hydrolyses to form $M^{+}$,$OH^{-}$ and $X$. Another compound $(M'O_2)$ of group $I$ element $(M')$ hydrolyses to form $(M')^{+}$,$OH^{-}$,$X$ and $Y$. What are $X$ and $Y$ respectively?

The metal which does not form ammonium nitrate by reaction with dilute nitric acid is

All compounds of alkali metals are easily soluble in water,but lithium compounds are more soluble in organic solvents. Explain.

Which of the nitrates on strong heating leaves the metal as the residue?

Which of the following is most stable?