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Topic Molecular geometry
Asked 2 times across 2 UPSC exams over 4 years (2019–2023), peaking in 2019.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2019
- Recurs across 2 years (2019–2023)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2019 → GEO 2023
How the concept evolved
Rising — more than half its appearances (2 of 2) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2023
Which one of the following is the shape of BrF5?
- A Octahedral
- B Square planar
- C Square pyramidal ✓
- D Trigonal bipyramidal
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
CDS2019
Match List-I with List-II and select the correct answer using the code given below the Lists
| List I (Compound/Molecule) | List II (Shape of Molecule) |
|---|
| A. CH3F | 1. Trigonal planar |
| B. HCHO | 2. Tetrahedral |
| C. HCN | 3. Trigonal pyramidal |
| D. NH3 | 4. Linear |
Codes:
- A A-2 B-4 C-1 D-3
- B A-2 B-1 C-4 D-3 ✓
- C A-3 B-4 C-1 D-2
- D A-3 B-1 C-4 D-2
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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