Which of the following compound is obtained on heating potassium ferrocyanide with concentrated $H_{2} S O_{4}$ ?

C O_{2}

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C O

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C_{2} H_{2}

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(C N)_{2}

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Solution

The correct option is D $C O$
If a little water is present, carbon monoxide is readily formed on warming, the best result being attained with acid of concentration corresponding to $H_{2} S O_{4} .2 H_{2} O$ , when dry anhydrous potassium ferrocyanide is employed; the reaction is then complete at $180 ° C$ .: -
$K_{4} [F e {(C N)}_{6}] + 8 (H_{2} S O_{4} .2 H_{2} O) ⇌ 4 K H S O_{4} + F e S O_{4} + 3 (N H_{4}) 2 S O_{4} + 6 C O + 10 H_{2} O .$

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H_{2} S O_{4}

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