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JEE Main · 2020 · 04 Sep 2020 · Shift 2 · General Principles and Processes of Isolation of Metals

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The processes of calcination and roasting in metallurgical industries, respectively, can lead to:
  1. (A)Photochemical smog and global warming
  2. (B)Global warming and photochemical smog
  3. (C)Global warming and acid rain✓ Correct
  4. (D)Photochemical smog and ozone layer depletion

Answer: (C)

Solution

Calcination heats a carbonate ore, usually out of contact with air, driving off , a greenhouse gas that promotes global warming. Roasting heats a sulphide ore in air, releasing , which dissolves in atmospheric moisture to form sulphurous and sulphuric acids and so leads to acid rain. Hence calcination leads to global warming and roasting to acid rain.

JEE Main · 2020 · 04 Sep 2020 · Shift 2 · Single correct option

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