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Topic Qualitative analysis
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
Lassaigne's test is used for the detection of which of the following elements?
- A N, S, P, Cl ✓
- B C, N, P, Br
- C C, N, S, I
- D C, N, S, Br
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CDS2019
Which one of the following elements cannot be detected by 'Lassaigne's test'?
- A I
- B Cl
- C S
- D P ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
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