Discussion
Hydrogen gas is used in
Answer: D
Hydrogen is used in all of the above.
It is the feedstock for ammonia in the Haber process, \(\mathrm{N_2 + 3H_2 \rightleftharpoons 2NH_3}\); it burns in chlorine to give hydrogen chloride, which dissolves in water as hydrochloric acid; and it combines with carbon monoxide over a catalyst to give methanol, \(\mathrm{CO + 2H_2 \rightarrow CH_3OH}\).
Since hydrogen is used in all three preparations, any single option is incomplete.
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