Why is nitric acid added to sodium extra...

Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

To neutralise alkaline solution of sodium fusion extract.

To convert sodium cyanide and sodium sulphide in to HCN and `H_(2)S` which are volatile.

To convert sodium cyanide and sodium sulphide in to sodium thiocyanate.

To get white precipitate of AgCN and black

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