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Topic Concentration of solutions
Asked 3 times across 2 UPSC exams over 9 years (2017–2026), peaking in 2026.
Key insights
- Most tested in GEO — 2 of 3 PYQs
- Most asked in 2026
- Recurs across 2 years (2017–2026)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2017 → GEO 2026
How the concept evolved
Rising — more than half its appearances (3 of 3) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2026
What is the molarity of NaOH in the solution prepared by dissolving its 4 g in 250 mL of solution? (The atomic mass of sodium is 23)
- A 0·04 M
- B 0·4 M
- C 4 M
- D 40 M
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
GEO2026
A solution is prepared by adding 4 g of a substance to 36 g of water. What is the mass percent of the solute?
- A 14·4%
- B 10%
- C 9%
- D 1%
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
CDS2017
The molecular mass of sulphuric acid is 98. If 49 g of the acid is dissolved in water to make one litre of solution, what will be the strength of the acid?
- A Two normal
- B One normal ✓
- C 0·5 normal
- D Four normal
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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