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Question

The gas evolved by heating potassium ferrocyanide crystals with conc.H2SO4 is :

A
CO
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B
CO2
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C
SO2
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D
SO3
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Solution

The correct option is A CO
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.

K4Fe(CN)6+6H2SO4+6H2O2K2SO4+FeSO4+3(NH4)2SO4+6CO

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