Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (04.09.2024) Shift-II
Which of the following is true about pyrolysis? Choose the correct answer from the options given below.
- 1. It produces less air pollution than complete incineration.
- 2. It is carried out in the presence of oxygen.
- 3. Instead of oxidation, a complex chain of decomposition and other chemical reactions occurs.
- 4. Pyrolysis often yields useful materials.
- 5. Pyrolysis is a high-temperature thermal process that is an alternative to incineration.
A1, 2, 3, 4 only
B1, 3, 4, 5 only ✓ Correct
C2, 3, 4, 5 only
D1, 2, 5 only
Correct answer: (B) 1, 3, 4, 5 only — The true statements are 1, 3, 4 and 5, so that is the answer.
Explanation
★The true statements are 1, 3, 4 and 5, so that is the answer.
★Pyrolysis produces less air pollution than complete incineration.
★Instead of oxidation, a complex chain of decomposition occurs.
★It often yields useful materials.
★It is a high-temperature alternative to incineration, but it is done without oxygen, so statement 2 is false.
★Hence 1, 3, 4 and 5 is correct.
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