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  4. Which one of the following combines with Fe(II) ions to form a brown complex?

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Q. Which one of the following combines with $Fe(II)$ ions to form a brown complex?

The p-Block Elements - Part2

Solution:

$NO$ reacts with $FeSO _{4}$ to form a brown ring complex, $\left[ Fe \left( H _{2} O \right)_{5} NO \right] SO _{4}$.