Why are sulphide ores converted to oxide before reduction?

Why are sulphide ores converted to oxide form before reduction to metal ?

Assertion (A): Usually the sulphide ore is converted to oxide before reduction. Reason (R): Reduction of oxides occurs easier.

Assertion : Usually the sulphide ore is converted to oxide before reduction. Reason : Reduction of oxides occurs easier.

Give reason for the statement. The sulphide ore is converted to oxide before reduction.

Explain the following (a) Generally sulphide ores are converted into oxides before reduction. (b) Silica is added to the sulphide ore of copper in the reverberatory furnance.

Assertion : Sulphide ores are converted to oxides before reduction. Reason : Oxides are easier to reduce.

Assertion : Sulphide ores are converted to oxides before reduction. Reason : Oxides are easier to reduce.

Sulphide ores are converted into oxides by

Why is it advantageous to roast a sulphide ore to the oxide before reduction ?