Which of the following will give blood-red colour inLassaigne's test for nitrogen?

P h N H_{2}

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P h N O_{2}

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S C N^{-}

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P h S O_{3} H

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Solution

The correct option is C $S C N^{-}$
Blood-red colour in Lassaigne's test for nitrogen is given by the compound which contains both S and N. Hence, (c) is correct option.

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