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Chemical Kinetics

Question
CBSEENCH12010964
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The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

  • Fe4[Fe(CN)6]3

  • Na4[Fe(CN)5NOS]

  • Fe(CN)3

  • Na3[Fe(CN)6]

Solution

A.

Fe4[Fe(CN)6]3

If nitrogen is present in the organic compound, then sodium extract contains Na4[Fe(CN)6].

Na space space plus space straight C plus space straight N space rightwards arrow with fuse on top space NaCN FeSO subscript 4 space plus space 6 NaCN space rightwards arrow with space on top space Na subscript 4 left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket space plus space Na subscript 2 SO subscript 4 straight A space changes space to space prussian space blue space Fe subscript 4 space left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket subscript 3 space on space reaction space with space FeCl subscript 3 4 space FeCl subscript 3 space plus space 3 Na subscript 4 space left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket space rightwards arrow with space on top space Fe subscript 4 space left parenthesis CN right parenthesis subscript 6 right square bracket subscript 3 space plus space 12 NaCl

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