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In which of the following reactions hydrogen is not liberated?
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Reaction of $\mathrm{NaOH}$ with sulphur
Sodium hydroxide reacts with sulphur to give sodium sulphide and sodium thiosulphate.
$4 \mathrm{~S}+6 \mathrm{NaOH} \rightarrow \underset{\substack{\text { sodium } \\ \text { sulphide }}}{2 \mathrm{Na}_2 \mathrm{~S}}+\underset{\substack{\text { sodium } \\ \text { thiosulphate }}}{\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3}+3 \mathrm{H}_2 \mathrm{O}$
$4 \mathrm{~S}+6 \mathrm{NaOH} \rightarrow \underset{\substack{\text { sodium } \\ \text { sulphide }}}{2 \mathrm{Na}_2 \mathrm{~S}}+\underset{\substack{\text { sodium } \\ \text { thiosulphate }}}{\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3}+3 \mathrm{H}_2 \mathrm{O}$
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