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Topic Hydrogenation
Asked 4 times across 3 UPSC exams over 5 years (2021–2026), peaking in 2024.
Key insights
- Most tested in NDA — 2 of 4 PYQs
- Most asked in 2024
- Recurs across 4 years (2021–2026)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
NDA 2021 → CDS 2024 → GEO 2026
How the concept evolved
Rising — more than half its appearances (4 of 4) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2026
The manufacturing of Vanaspati Ghee from polyunsaturated vegetable oils involves which one of the following processes?
- A Refining of oil
- B Oxidation of oil
- C Hydrogenation of oil
- D Reduction of oil
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
CDS2024
Which of the following catalytic systems is used for the reduction of unsaturated hydrocarbon to saturated hydrocarbon?
- A Copper and H2
- B Iron and H2
- C Zinc and H2
- D Nickel and H2 ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
NDA2022
Liquid vegetable oils are converted to solid margarine by the use of
- A hydrogen gas ✓
- B chlorine gas
- C carbon dioxide gas
- D oxygen gas
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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