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The LaSSaigen's extract is boiled with c...

The LaSSaigen's extract is boiled with conc. `HNO_(3)` while testing for halogens. By doing so it `:`

A

Increase the concentration of `NO_(3)^(-)`

B

Decomposes `Na_(2)S` and NaCN , if formed

C

Helps in the precipitation of AgCl

D

Increases the solubility product of AgCl

Text Solution

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The correct Answer is:
B
Lassaigne’s solution is boiled with `HNO_3` to decompose NaCN to HCN and `Na_2S` to `H_2S` which removes all nitrogen and sulphur present in the solution so that only halogen will be available for testing.
`NaCN + HNO_(3) to NaNO_(3) + HCN`
`Na_(2)S + 2HNO_(3) to 2NaNO_(3) + H_(2)`
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