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Question

The Lassaigne’s extract is boiled with conc. HNO3 before testing for halogens because:

A
AgCN is soluble in HNO3
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B
Silver halides are soluble in HNO3
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C
NaCN and Na2S are decomposed by HNO3
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D
Ag2S is soluble in HNO3
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Solution

The correct option is C NaCN and Na2S are decomposed by HNO3
The Lassaigne’s extract is boiled with conc. HNO3 before testing for halogens because the cyanide and sulphide ions present in the extract will interfere in the detection of halogens.
These ions should be removed by boiling the sodium fusion extract with concentrated nitric acid which will decompose the cyanide or sulphide.

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