$NaOH$ can be transported in the container made up of ?

Which element of group-$1$ has the highest hydration enthalpy? Why?

The compound which is not associated with the Solvay ammonia process for the production of $Na_2CO_3$ is:

Which of the following reactions occurs when $AgNO_3$ is heated above its melting point?

$NH_3 + CO_2 + H_2O \to A$
$A + H_2O + CO_2 \to B$
$B + NaCl \to C + NH_4Cl$
$C \xrightarrow{\Delta} D + H_2O + CO_2$
Identify the incorrect statement.

The atomic radii of alkali metals $(M)$ lie in the order $Li < Na < K < Rb$,but the radii of $M^{+}$ ions in aqueous solution lie in the reverse order $Li^{+} > Na^{+} > K^{+} > Rb^{+}$. What is the reason for this reverse order (on going from $Li$ to $Rb$)?