The gas which is absorbed by ferrous sulphate | vedclass

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(A) The reaction of nitric oxide $(NO)$ with ferrous sulphate $(FeSO_4)$ solution is used in the brown ring test for nitrates.The reaction is: $3FeSO_

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$NO$

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(A) The reaction of nitric oxide $(NO)$ with ferrous sulphate $(FeSO_4)$ solution is used in the brown ring test for nitrates.The reaction is: $3FeSO_4 + NO + 2H_2SO_4 	o Fe_2(SO_4)_3 + [Fe(H_2O)_5(NO)]SO_4 + H_2O$.The complex $[Fe(H_2O)_5(NO)]SO_4$ (often represented as $FeSO_4 \cdot NO$) is responsible for the characteristic blackish-brown colour.

The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is

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