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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.
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.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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 as slag.
Lead oxide is reduced to metals by C-
PbO+C→Pb+CO
Option A is correct.
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 as slag.
Lead oxide is reduced to metals by C-
PbO+C→Pb+CO
Option A is correct.
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