Question

ASSERTION: In smelting, roasted ore is heated with powdered coke in presence of a flux.
REASON: Oxides are reduced to metals by C or CO. Impurities are removed as slag.
A.Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B.Both Assertion and Reason are correct but Reason Assertion not the correct explanation for
C.Assertion is correct but Reason incorrect
D.Both Assertion and Reason are incorrect

Answer 1

Smelting includes the process of concentrating the ore, reducing the metal compound to obtain the metal and purify the metals too. With the smelting process, we can obtain metals like iron, silver and copper from its ores. – Carbon reduces metal oxide and converts itself to carbon monoxide first and then it gets further oxidized to carbon dioxide. Reduction of metal oxides becomes favourable due to high temperature.

Complete step by step answer:
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.
Smelting primarily produces a metal from its ore. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as slag and leaving just the metal behind. The reducing agent is commonly a source of carbon. Carbon (or carbon monoxide) removes oxygen from the ore, leaving behind elemental metal. As most ores are impure, it is often necessary to use flux, such as limestone, to remove the accompanying rock gangue and slag.
Lead oxide is reduced to metals by C.
$PbO + C \to Pb + CO$

Therefore, the correct answer is option (A).

Note: Extraction of iron is done by reduction of its oxide ore in blast furnaces. Copper is extracted by smelting and heating in a reverberatory furnace. Extraction of zinc from zinc oxides is done using coke. Several methods are employed in refining the metal. Metals, in general, are very widely used and have contributed significantly in the development of a variety of industries.