On heating potassium ferrocyanide with c...

On heating potassium ferrocyanide with concentrated sulphuric acid produces a neutral gas A. The gas A on treament with caustic soda under high pressure prouded B. What are A and B respectively.

`CO_(2), Na_(2)CO_(3)`

`SO_(2), Na_(2)SO_(4)`

`CO,HCOONa`

`NO,NaNO_(3)`

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