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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt094

Select the correct statements about roasting of sulphide ores.

AThe ore is heated above its melting point so that it fuses completely.
BSulphur of the sulphide is converted mainly into $SO X_{2}$ .
CArsenic and antimony impurities can leave as volatile oxides.
DThe ore is heated in excess air below its melting point.

Answer: B, C, D

Roasting uses excess air below the fusion temperature, oxidises sulphur to

SO X_{2}

and removes volatile oxides such as

As X_{2} O X_{3}

. Fusing the ore is not the aim of roasting.

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