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  4. A filter paper moistened with ammoniacal sodium nitroprusside solution turns violet on contact with a drop of alkaline Na 2 S solution. The violet colour is due to the formation of

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Q. A filter paper moistened with ammoniacal sodium nitroprusside solution turns violet on contact with a drop of alkaline $Na _{2} S$ solution. The violet colour is due to the formation of

Coordination Compounds

Solution:

$Na _{2} S + Na _{2}[ Fe ( CN )_{5} NO] \to Na _{4}[ Fe \underset{\text{(Violet)}}{( CN )_{5}} NOS ]$