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The function of boiling the sodium extra...

The function of boiling the sodium extract with conc.` HNO_3` before testing for halogens is :

A

To make solution clear

B

To destroy CN- and `S^2 -ions which will otherwise give ppt.

C

To make the solution acidic

D

To convert `Fe^2+ to Fe^3+ `

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Verified by Experts

The correct Answer is:
B
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