When potassium ferrocyanide crystal are heated with concentrated sulphuric acid,the gas evolved as?

carbon monoxide

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sulphur dioxide

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ammonia

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carbon dioxide

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Solution

The correct option is A carbon monoxide
$K_{4} [F e (C N)_{6}] + 8 (H_{2} S O_{4} .2 H_{2} O) Δ - \to 4 K H S O_{4} + F e S O_{4} + 3 (N H_{4})_{2} S O_{4} + 6 C O (g) + 10 H_{2} O$

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H_{2} {S O}_{4}

H_{2} S O_{4}

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