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Question
Which of the following compund is added to the sodium extract before addition of silver nitrate for testing of halogens?
Which of the following compund is added to the sodium extract before addition of silver nitrate for testing of halogens?
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Solution
The correct option is C Nitric acid
For test of halogens, the lassaigne solution is first treated with dil. HNO3. The addition of this acid decomposes NaCN to HCN and Na2S to H2S so as to remove all the nitrogen and sulphur content in the solution and only halogen would be available for testing.
For test of halogens, the lassaigne solution is first treated with dil. HNO3. The addition of this acid decomposes NaCN to HCN and Na2S to H2S 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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