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The formula of the purple colour formed in Lassaine’s test for sulphur using sodium nitroprusside is

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$N a F e [F e {(C N)}_{6}]$

$N a [C r {(N H_{3})}_{2} {(N C S)}_{4}]$

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

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

answer is D.

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Detailed Solution

${Na}_{2} [Fe (CN)_{5} NO] + {Na}_{2} S$

Sodiumnitroprusside

$\to {Na}_{4} [Fe (CN)_{5} NOS]$

Sodiumthionitroprusside

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