Formation of , a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

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Canvas Classes · Accepted Answer

Step 1: Recall the Lassaigne Test for Sulphur

In the Lassaigne test, an organic compound is fused with sodium metal to convert covalently bonded elements into ionic form:

Sodium sulphide () is formed from the sulphur in the compound.

Step 2: The Sodium Nitroprusside Test for Sulphide

The sodium extract (containing ) is treated with sodium nitroprusside :

The product  is violet/purple in colour. This is the confirmatory test for sulphide ion ().

Step 3: Evaluate Each Option

| Option | I

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