1.

During the test of halogens by silver nitrate test, the sodium extract is first boiled with a few drops of conc. HNO_3 to

Answer»

decompose sodium halides present
decompose sodium cyanide if present
decompose sodium SULPHIDE if present
acidify the sodium extract.

Solution :Boiling sodium extract with a few drops of conc. `HNO_(3)` decompose `NaCN` (if present ) and `Na_2 S` (if present)
`NaCN + HNO_(3) overset(Delta)(to) HCN UARR NaNO_(3)`
`Na_(2) S+ 2 HNO_(3) overset(Delta)(to) H_(2) S uarr + 2 NaNO_(3)`
Nitric acid also acidify the sodium extract . An alkaline sodium extract will give a white PPT. AgOH and `AgNO_3` solution .
`NaOH + AgNO_(3) to AgOH darr+ NaNO_(3)`


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