1.

In the brown ring test , the brown colour of the ring is due to

Answer»

a MIXTURE of NO and `NO_(2)`
nitrosoferrous SULPHATE
ferrous nitrate
ferric nitrate

Solution :No forms dark brown nitrosoferrous sulphate.
`underset("Impure GAS")(FeSO_(4)+NO)tounderset("dark brown")(FeSO_(4)*NO)`(Nitrosoferrous sulphate) When this solution is heated , pure nitric OXIDE is liberated .
`FeSO_(4)*NOoverset("heat")toFeSO_(4)+underset("pure gas")(NO)`


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