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Potassium ferrocyaoide is heated in the ...

Potassium ferrocyaoide is heated in the presence of concentrated `H_2SO_4` and the gas thus obtained is passed over finely divided nickel powder at `50^@C`.

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When potassium ferrocyanide is heated with concentrated sulphuric acid, potassium sulphate, ammonium sulphate, ferrous sulphate and carbon monoxide are formed. When the resulting CO gas is passed over finely divided nickel at `50^@C`, nickel tetracarbonyl (a coordinated complex) is formed.
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