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Which of the following reactions is an example of use of water gas in the synthesis of other compounds?
(a) \( \mathrm{CH}_{4}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \underset{\mathrm{Ni}}{\stackrel{1270 \mathrm{~K}}{\longrightarrow}} \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2}(\mathrm{~g}) \)
(b) \( \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \underset{\text { Catalyst }}{\stackrel{673 \mathrm{~K}}{\longrightarrow}} \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2}(\mathrm{~g}) \)
(c) \( \mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}+2}+\mathrm{nH}_{2} \mathrm{O}(\mathrm{g}) \underset{\mathrm{Ni}}{\stackrel{1270 \mathrm{~K}}{\longrightarrow}} \mathrm{nCO}+(2 \mathrm{n}+1) \mathrm{H}_{2} \)
(d) \( \mathrm{CO}(\mathrm{g})+2 \mathrm{H}_{2}(\mathrm{~g}) \underset{\text { Catalyst }}{\stackrel{\text { Cobalt }}{\longrightarrow}} \mathrm{CH}_{3} \mathrm{OH}(1) \)
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