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Lassaigne's extract is botted with dilut...

Lassaigne's extract is botted with dilute `HNO_(3)` before testing for halogens because :

A

Silver halides are soluble in `HNO_(3)`

B

`Na_(2)S` and NaCN are decomposed by `HNO_(3)`

C

`Ag_(2)S` is soluble in `HNO_(3)`

D

`AgCN` is soluble in `HNO_(3)`

Text Solution

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The correct Answer is:
B
Both `Na_(2)S` and `NaCN` are decomposed by `HNO_(3)` to form volatile vapours.
`Na_(2)S+2HNO_(3) rarr 2NaNO_(3)+H_(2)S`
`NaCN+HNO_(3) rarr NaNO_(3)+HCN`
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  11. Nitrogen in an organic compound can be estimated by :

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