Topic Oxides
Asked 2 times across 2 UPSC exams over 3 years (2022–2025), peaking in 2022.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2022
- Recurs across 2 years (2022–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2022 → GEO 2025
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.
GEO2025
Match List-I with List-II and select the correct answer using the code given below the Lists
| List I (Compound) | List II (Type of oxide) |
|---|
| A. H₂O | 1. Amphoteric |
| B. Na₂O | 2. Acidic |
| C. Al₂O₃ | 3. Neutral |
| D. CO₂ | 4. Basic |
Codes:
- A A-3 B-4 C-1 D-2 ✓
- B A-2 B-1 C-4 D-3
- C A-3 B-1 C-4 D-2
- D A-2 B-4 C-1 D-3
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CDS2022
Which one of the following statements is true when non-metals are dissolved in water ?
- A They produce basic oxides.
- B They produce acidic oxides. ✓
- C They produce neutral oxides.
- D They provide hydroxides.
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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