Blood-red colour in the detection of both N and S in Lassaigne's extract is due to the formation of__________.

F e (C N S)_{2}

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F e (C N S)_{3}

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

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K_{3} [F e (C N)_{6}]

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Solution

The correct option is A $F e (C N S)_{3}$
If both nitrogen and sulphur are present in an organic compound, sodium fusion will convert it into sodium thiocyanate which then react with $F e^{3 +}$ to form blood colour complex $[F e (S C N)_{3}]$

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Blood-red colour in the detection of both N and S in Lassaigne's extract is due to the formation of__________.

The correct option is A Fe(CNS)3If both nitrogen and sulphur are present in an organic compound, sodium fusion will convert it into sodium thiocyanate which then react with Fe3+ to form blood colour complex [Fe(SCN)3]

The correct option is A $F e (C N S)_{3}$
If both nitrogen and sulphur are present in an organic compound, sodium fusion will convert it into sodium thiocyanate which then react with $F e^{3 +}$ to form blood colour complex $[F e (S C N)_{3}]$