The processes of calcination and roasting in metallurgical …

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) JEE Main 2020 Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

The processes of calcination and roasting in metallurgical industries, respectively, can lead to

Global warming and photochemical smog

Photochemical smog and ozone layer depletion

Photochemical smog and global warming

Global warming and acid rain

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The correct answer is:

JEE Main 2020
Calcination: Heating of concentrated ore in the absence (or limited supply of air). Mainly used for carbonate ores.

(causes Global warming) Roasting: Heating of concentrated ore in a regular supply of air. Mainly used for sulphide ores.

(causes acid rain)

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