When sodium is dissolved in liquid ammonia,a deep blue coloured solution is obtained. This colour of the solution is due to:

$(a)$ Describe the chemical properties of alkali metals with air,water,dihydrogen,and halogens.
$(b)$ Explain the reduction potential of alkali metal elements.
$(c)$ Which type of solutions are formed on the reaction of alkali metals with liquid ammonia?

Which one of the following statements is not correct?

$NaNO_3$ on heating gives which gas?

$Al +$ aq. $NaOH$ (excess) $\longrightarrow P + Q$. $P$ and $Q$ are

Which of the following statements is correct regarding the solubility of carbonates?