Hydrogen may be prepared by heating a solution of caustic soda with :

In water-gas shift reaction, hydrogen gas is produced from the reaction of steam with.

The equation that represents the water-gas shift reaction is :

Which gas is evolved at the anode during the electrolysis of ${\mathrm{KHF}}_2$ in anhydrous $\mathrm{HF}$?

Given below are two reactions, involved in the commercial production of dihydrogen $\left({\mathrm{H}}_2\right)$. The two reactions are carried out at temperature “${\mathrm{T}}_1$” and “${\mathrm{T}}_2$”, respectively

$\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\stackrel{{\mathrm{T}}_1}{⟶}\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

$\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\frac{{\mathrm{T}}_2}{\mathrm{Catalyst}}{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

The temperatures ${\mathrm{T}}_1$ and ${\mathrm{T}}_2$ are correctly related as