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Q.

In Lassaign’s extract of an organic compound, both nitrogen and sulphur are present which gives blood red colour with Fe3+ due to the formation of

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a

Fe4[(CN)6]3 .x.H2O

b

NaSCN

c

[Fe(SCN)]2+

d

[Fe(CN)5NOS]4-

answer is A.

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Detailed Solution

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Na+C+N+S→NaSCNFe+3+SCN−→[Fe(SCN)Blood Red]+2

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In Lassaign’s extract of an organic compound, both nitrogen and sulphur are present which gives blood red colour with Fe3+ due to the formation of