Which of the following upon hydrolysis can produce a hydrocarbon that has the same degree of unsaturation as the number of carbon atoms present in the produced hydrocarbon?

Water gas is

In which of the following processes is the highest purity $(99.9 \%)$ hydrogen obtained?

Fire extinguishers contain $H_2SO_4$ and

Hydrogen can be prepared by mixing steam and water gas at $500 \, ^oC$ in the presence of $Fe_3O_4$ and $Cr_2O_3$ as catalysts. This process is called:

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.