Pure dihydrogen $(99.95\%)$ is obtained by the electrolysis of

Which compound is formed on catalytic hydrogenation of carbon monoxide at high $p$ and high $T$ in the presence of $ZnO-Cr_2O_3$ catalyst?

Which property of interstitial hydrides is correct?

Hydrogen can be produced by heating

Calorific value of producer gas is low because of

Identify the correct statements about the hydrides.
$(I)$ In saline hydrides,the oxidation state of hydrogen is $-1$.
$(II)$ $LaH_{2.87}$ is an example of an interstitial hydride.
$(III)$ $NH_3$ and $H_2O$ have the tendency to form hydrogen bonds.
$(IV)$ Electrolysis of molten sodium hydride liberates $H_2$ gas at the anode.