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Standard XII
Chemistry
Nitrogen
Question

How many of them give prussian blue colour when its sodium extract is treated with FeSO4 ?
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Solution
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Five compounds (III, IV, V, VI, VII) give prussian blue colour when its sodium extract is treated with frrous sulphate.
This is test for N and is not given by hydrazine and hydroxyl amine as they do not contain C atom.
This test is not given by urea due to deficiency of carbon atom.
This test is not given by benzoic acid and phenol due to an absence of nitrogen.
Ans-5

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