1.

In the extraction of silver by Mac-arther cyanide process, a small of KNO_(3) is also added as a flux. The function of KNO_(3) is:

Answer»

to oxidise Ag in the native form to `Ag^(+)`
to oxidise lead and ZINC impurities
to form a complec with `Ag^(+)` which is then REDUCED to metallic SILVER by using zinc
to oxidise the sulphur in the argentite ore to `SO_(2)` which escapes from the reaction

Answer :B


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