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GATE 2021 CE (CE1) – Question 21

Air Pollution and Municipal Solid Wastes · Municipal solid wastes: generation, collection, transportation and management · 1 mark · Multiple choice

Which statement is correct?

  1. Pyrolysis is endothermic and takes place without oxygen.
  2. Pyrolysis is exothermic and takes place without oxygen.
  3. Combustion is endothermic and takes place with abundant oxygen.
  4. Combustion is exothermic and takes place without oxygen.

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Show answer and explanation

Correct answer: (A) Pyrolysis is endothermic and takes place without oxygen.

Explanation

Pyrolysis decomposes organic material by supplying heat in the absence of oxygen. It is therefore classified as an endothermic thermal process. Combustion releases heat and requires an oxidant, so the two combustion statements are false. **Answer: A**.