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

Options

A. increases the concentration of `NO_(3)^(-)` ions
B. decomposes `Na_(2)S` and `NaCN`, if formed
C. helps in the precipitation of `AgCl`
D. increases the solubility product of `AgCl`

Answer

B

Explanation

`Na_(2)S` and `NaCN` are decomposed on heating with `HNO_(3)` to form `H_(2)S` and `HCN` in gaseous phase otherwise they will give precipitate with `AgNO_(3)`
`NaCN+HNO_(3) rarr NaNO_(3)+HCN uarr`
`Na_(2)S+2HNO_(3) rarr 2NaNO_(3)+H_(2)S`