Which of the following compund is added to the sodium extract before addition of silver nitrate for testing of halogens?

Ammonia

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Hydrochloric acid

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Nitric acid

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Sodium hydroxide

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Solution

The correct option is C Nitric acid
For test of halogens, the lassaigne solution is first treated with dil. $H N O_{3}$ . The addition of this acid decomposes $N a C N$ to $H C N$ and $N a_{2} S$ to $H_{2} S$ so as to remove all the nitrogen and sulphur content in the solution and only halogen would be available for testing.

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Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

H N O_{3}

H N O_{3}

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(A g N O_{3})

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