The gas evolved by heating potassium ferrocyanide crystals with conc. $H_{2} S O_{4}$ is :

C O

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C O_{2}

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S O_{2}

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S O_{3}

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Solution

The correct option is A $C O$
Reaction:

Potassium hexacyanoferrate(II) react with sulfuric acid and water to produce potassium sulfate, iron(II) sulfate, ammonium sulfate and carbon monoxide. Sulfuric acid - concentrated solution. The reaction takes place in a boiling solution.

$K_{4} F e (C N)_{6} + 6 H_{2} S O_{4} + 6 H_{2} O \to 2 K_{2} S O_{4} + F e S O_{4} + 3 (N H_{4})_{2} S O_{4} + 6 C O$

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