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The function of boiling the sodium extra...

The function of boiling the sodium extract with concentrated nitric acid before testing halogens is

A

to make solution acidic

B

to make solution clear

C

to convert `Fe^(+2)` to `Fe^(+3)`

D

to convert NaCN to HCN and `Na_(2)S` to `H_(2)S` so that they do not interfere with `AgNO_(3)`

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The correct Answer is:
D
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