The formula of the compound which gives violet color in Lassaigne's test for sulphur with sodium nitroprusside is :

N a_{4} [F e {(C N)}_{6} S]

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N a_{4} [F e {(C N)}_{5} N C S]

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N a_{4} [F e {(C N)}_{5} N O S]

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N a_{2} [F e {(C N)}_{5} N O S]

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Solution

The correct option is C $N a_{4} [F e {(C N)}_{5} N O S]$
$N a + S ⟶ N a_{2} S$
$N a_{2} S + N a_{2} [F e {(C N)}_{5} N O] ⟶ N a_{4} [F e {(C N)}_{5} N O S]$

The formula of the compound which gives violet color in Lassaigne's test for sulphur with sodium nitroprusside is $N a_{4} [F e {(C N)}_{5} N O S]$ .

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