(A) In smelting, roasted ore is heated with powdered coke in presence of a flux.
(R) Oxides are reduced to metals by carbon or carbonmonoxide. Impurities are removed as slag.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

Smelting is a form of extractive metallurgy to produce a metal from its ore.
Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind.
The reducing agent is commonly a source of carbon such as coke, charcoal, and coal.
As most ores are impure, it is often necessary to use flux, such as limestone, to remove the accompanying rock gangue as slag.
Lead oxide is reduced to metals by C
PbO + C →Pb +CO

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