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How can you get pure CO from potassium f...

How can you get pure CO from potassium ferrocyanide?

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When potassium ferrocyanide is heated with excess of conc. `H_2SO_4` pure carbon monoxide is obtained
`K_4[Fe(CN)_6]+6H_2SO_4+6H_2O=2K_2SO_4+3(NH_4)_2SO_4+FeSO_4+6CO`
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