A) sulphur dioxide
B) ammonia
C) carbon dioxide
D) carbon monoxide
Correct Answer: D
Solution :
\[\underset{Pot.\,ferrocyanide}{\mathop{{{K}_{4}}[Fe{{(CN)}_{6}}]}}\,+6{{H}_{2}}S{{O}_{4}}+6{{H}_{2}}O\xrightarrow{Heat}\] \[2{{K}_{2}}S{{O}_{4}}+{{(N{{H}_{4}})}_{2}}S{{O}_{4}}+6CO+FeS{{O}_{4}}\] Therefore, carbon monoxide gas is evolved.
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