. Calcination and roasting processes of ores to form their oxides are beneficial :

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to convert ores into porous form so that their reduction becomes easier.

as impurities like S, As, Sb, are removed.

as organic impurities are removed.

as the ores are converted into oxide form which makes the reduction easier.

answer is A.

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Detailed Solution

To convert ore into a porous state to facilitate simpler redistillation. as S, As, and Sb are eliminated as contaminants. by removing organic contaminants. because the conversion of the ores into oxide form facilitates reduction.

Sulfur, arsenic, phosphorus, and other non-metal impurities are oxidised and eliminated as volatile gas. These contaminants react with oxygen gas to form non-metal oxides, which are volatile gases.

The smallest amount of hot solvent necessary to dissolve the desired chemical is added to the impure solid and heated. The desired chemical is then crystallised and recovered by suction filtration after the insoluble material is filtered while the solution is maintained hot.

For oxide ores, the reduction process is simpler. The ore is simpler to convert to metal after roasting. Because oxide ore is produced here when sulphide ore occurs.

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