JEE Main 2023 — Hydrogen Question with Solution

(A) Hydrogen reacts with carbon monoxide in presence of cobalt catalyst to give methanol

$$2{\mathrm{H}}_2(\mathrm{g})+\mathrm{CO}(\mathrm{g})\stackrel{\text{ cobalt catalyst }}{⟶}{\mathrm{CH}}_3\mathrm{OH}(\mathrm{I})$$

(B) Syn gas is produced from coal and the process is called coal gasification.

$$\mathrm{C}(\mathrm{s})+{\mathrm{H}}_2\mathrm{O}(\mathrm{g})\stackrel{1270\mathrm{K}}{⟶}\underset{(\text{ syn gas) }}{\mathrm{CO}(\mathrm{g})+{\mathrm{H}}_2(\mathrm{g})}$$

(C) Reaction of steam with hydrocarbons or coke at high temperature in presence of nickel catalyst gives a mixture of $\mathrm{CO}$ and ${\mathrm{H}}_2$, called water gas

$${\mathrm{CH}}_4(\mathrm{g})+{\mathrm{H}}_2\mathrm{O}(\mathrm{g})\underset{\mathrm{Ni}}{\stackrel{1270\mathrm{K}}{⟶}}\underset{(\text{ water gas })}{\mathrm{CO}(\mathrm{g})+3{\mathrm{H}}_2(\mathrm{g})}$$

(D) Electrolysis of brine solution produces ${\mathrm{H}}_2$ gas at cathode and ${\mathrm{Cl}}_2$ gas at anode

$\mathrm{NaCl}(\mathrm{aq})⟶{\mathrm{Na}}^{+}(\mathrm{aq})+{\mathrm{Cl}}^{-}(\mathrm{aq})$

Cathode : $2{\mathrm{H}}_2\mathrm{O}(\mathrm{l})+2{\mathrm{e}}^{-}⟶{\mathrm{H}}_2(\mathrm{g})+2{\mathrm{OH}}^{-}(\mathrm{aq})$

Anode : $2{\mathrm{Cl}}^{-}(\mathrm{aq})⟶{\mathrm{Cl}}_2(\mathrm{g})+2{\mathrm{e}}^{-}$