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When potassium ferrocyanide crystals are...

When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is

A

Ammonia

B

Sulphur dioxide

C

Carbon dioxide

D

Carbon monoxide

Text Solution

Verified by Experts

The correct Answer is:
D
The reaction completed at `180^(@)C`
`K_(4)[Fe(CN)_(6)]+8(H_(2)SO_(4).2H_(2)O)to4KHSO_(4)+FeSO_(4)+3(NH_(4))_(2)SO_(4)+6CO+10H_(2)O`.
This is a very convenient method of preparing pure carbon monoxide.
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