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Q.

The Lassaigne’s extract is boiled with conc. HNO3  while testing for the halogens. By doing so it.

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a

helps in the precipitation of AgCl

b

increases the concentration of  NO3−  ions

c

decomposes Na2S and NaCN  if formed

d

Increases the solubility product of AgCl

answer is A.

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Detailed Solution

Before the test of halogen, Lassaign’s extract is boiled with concentration HNO3  to remove  Na2Sand NaCN in form of H2S  and HCN.

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