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  4. Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of

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Q. Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

WBJEEWBJEE 2015Coordination Compounds

Solution:

Cold $FeSO _{4}$ solution on absorption of NO develops brown colour due to the formation of $\left[ Fe \left( H _{2} O \right)_{5}( NO )\right] SO _{4}$.
$FeSO _{4}+ NO +5 H _{2} O \longrightarrow \underset{\text{Brown ring complex}}{\left[ Fe \left( H _{2} O \right)_{5}( NO )\right] SO _{4}}$
This complex has $3.89\, BM$ magnetic moment shows that it has 3 unpaired electrons.