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Topic Redox reaction
Asked 2 times across 2 UPSC exams over 2 years (2021–2023), peaking in 2021.
Key insights
- Most tested in CAPF — 1 of 2 PYQs
- Most asked in 2021
- Recurs across 2 years (2021–2023)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CAPF 2021 → NDA 2023
How the concept evolved
Rising — more than half its appearances (2 of 2) 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.
NDA2023
Consider the following reaction : Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s) Which of the following statements about the given reaction is NOT correct ?
- A It is an example of displacement reaction
- B It is highly endothermic reaction ✓
- C Fe2O3 acts as oxidizing agent
- D This reaction is applicable to joining of railway tracks
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
CAPF2021
Manganese is extracted by heating manganese dioxide with aluminium powder. Which one of the following statements with regard to the reaction is correct?
- A The reaction is exothermic. ✓
- B The reaction is endothermic.
- C Manganese is produced as a solid.
- D Manganese is more reactive than aluminium.
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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