When $CO$ is passed over solid $NaOH$ heated to $200\,^{\circ}C$,it forms

Which metal nitrate liberates $NO_{2}$ gas upon heating?

What is zeolite among the following?

$Na_2CO_3$ can be manufactured by Solvay's process,but $K_2CO_3$ cannot be prepared by this method because:

Identify the products $A, B, C, D$ in the reactions given below:
$(X) \ NaCl \xrightarrow{\text{Aq. Electrolysis}} A + B(g) + Cl_2$
$A + Al \rightarrow NaAlO_2 + B(g)$
$(Y) \ A + Cl_2 \rightarrow C + D + H_2O$

Nitrates of all metals are: