When conc. H2SO4 was treated with K4[Fe(CN)6], CO gas was evolved. By mistake, somebody used dilute — Qualitative and Quantitative Analysis Chemistry Question
Question
When conc. H2SO4 was treated with K4[Fe(CN)6], CO gas was evolved. By mistake, somebody used dilute H2SO4 instead of conc. H2SO4, then the gas evolved was:
Answer: B
💡 Solution & Explanation
K4[Fe(CN)6] + 6H2SO4(conc.) + 6H2O -> 2K2SO4 + FeSO4 + 3(NH4)2SO4 + 6CO↑. With dilute H2SO4, it yields poisonous HCN gas: K4[Fe(CN)6] + 3H2SO4(dil.) -> 2K2SO4 + FeSO4 + 6HCN↑.
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