Practical Chemistry NEET Previous Year Questions (PYQs)
Practice NEET previous year questions from Principles Related to Practical Chemistry, covering detection of elements/functional groups, salt analysis, titration, qualitative tests, indicators and volumetric exercises with answers and clear explanations.
Q1. In salt analysis, the confirmatory test for chloride ion is:
- (A) White precipitate with AgNO3
- (B) Blue solution with CuSO4
- (C) Yellow flame
- (D) Brown ring formation
Show Answer
(A)
Show Explanation
Cl− gives white precipitate of AgCl with AgNO3.
Q2. The test used for detection of nitrogen in organic compounds is:
- (A) Flame test
- (B) Lassaigne’s test
- (C) Borax bead test
- (D) Brown ring test
Show Answer
(B)
Show Explanation
Lassaigne’s test detects nitrogen by forming sodium cyanide when fused with sodium.
Q3. Which indicator shows a colour change at the endpoint of an acid-base titration?
- (A) Methyl orange
- (B) KMnO4
- (C) AgNO3
- (D) HCl
Show Answer
(A)
Show Explanation
Methyl orange changes colour in acid-base titrations.
Q4. Phenolphthalein is a suitable indicator for:
- (A) Oxalic acid vs NaOH titration
- (B) HCl vs HNO3
- (C) KMnO4 redox titration
- (D) Salt analysis
Show Answer
(A)
Show Explanation
Phenolphthalein changes colour around pH ≈8–10, suitable for oxalic acid vs NaOH titration. :contentReference[oaicite:1]{index=1}
Q5. During preparation of Mohr’s salt, acid is added mainly to:
- (A) Increase pH
- (B) Prevent hydrolysis of Fe2+
- (C) Oxidise Fe2+
- (D) Form complex
Show Answer
(B)
Show Explanation
Acid prevents Fe2+ hydrolysis, keeping it in solution. :contentReference[oaicite:2]{index=2}
Q6. Which gas evolves when sulphite ion is treated with warm dilute H2SO4?
- (A) CO2
- (B) SO2
- (C) NO2
- (D) O2
Show Answer
(B)
Show Explanation
Sulphite ion oxidises to SO2 on acidification. :contentReference[oaicite:3]{index=3}
Q7. In preliminary test for anions, the pungent smell of acid suggests the presence of:
- (A) Chloride
- (B) Sulphide
- (C) Nitrate
- (D) Carbonate
Show Answer
(A)
Show Explanation
Chlorides release HCl fumes with acid giving pungent smell. :contentReference[oaicite:4]{index=4}
Q8. In salt analysis, Beilstein test detects:
- (A) Nitrogen
- (B) Oxygen
- (C) Halogens
- (D) Carbon
Show Answer
(C)
Show Explanation
Beilstein test shows green flame for halogens. :contentReference[oaicite:5]{index=5}
Q9. A primary indicator for acid-base titration is which type of change?
- (A) Temperature change
- (B) Colour change
- (C) Precipitate formation
- (D) Smell change
Show Answer
(B)
Show Explanation
Indicator changes colour at endpoint signalling neutralisation. :contentReference[oaicite:6]{index=6}
Q10. In a conductometric titration of strong acid vs strong base, the conductivity :
- (A) Increases then decreases
- (B) Always increases
- (C) Always decreases
- (D) Remains constant
Show Answer
(A)
Show Explanation
Conductivity decreases towards equivalence and then increases after. :contentReference[oaicite:7]{index=7}
Q11. Salt analysis aims to identify:
- (A) Only cations
- (B) Only anions
- (C) Both cations and anions
- (D) Only acids
Show Answer
(C)
Show Explanation
Salt analysis identifies both cations and anions in inorganic salt. :contentReference[oaicite:8]{index=8}
Q12. A common confirmatory test for carbonate ion is:
- (A) Effervescence with acid
- (B) Blue precipitate
- (C) Green flame
- (D) Violet ring
Show Answer
(A)
Show Explanation
Carbonates effervesce CO2 with acid.
Q13. Which reagent is used to confirm Ca2+ in qualitative analysis?
- (A) Potassium chromate
- (B) Silver nitrate
- (C) Lead acetate
- (D) Ammonia
Show Answer
(A)
Show Explanation
Ca2+ gives red precipitate with potassium chromate. :contentReference[oaicite:9]{index=9}
Q14. In Kjeldahl’s method, organic nitrogen is converted into:
- (A) NO
- (B) NH3
- (C) N2
- (D) NO2
Show Answer
(B)
Show Explanation
Nitrogen is converted to ammonia. :contentReference[oaicite:10]{index=10}
Q15. When permanganate is used in titration, its endpoint is detected by:
- (A) Colour change
- (B) Precipitate
- (C) pH change
- (D) Smell
Show Answer
(A)
Show Explanation
KMnO4 is self-indicator due to colour change.
Q16. In qualitative inorganic analysis, the preliminary test is based on:
- (A) Colour
- (B) Gas evolution
- (C) Flame test
- (D) All of these
Show Answer
(D)
Show Explanation
Preliminary tests use colour, flame colour and gas tests. :contentReference[oaicite:11]{index=11}
Q17. An insoluble sulphide precipitate with ammoniacal H2S indicates:
- (A) Group I cation
- (B) Group II cation
- (C) Transition metal cation
- (D) Noble gas
Show Answer
(C)
Show Explanation
Transition metal cations form insoluble sulphides in ammoniacal H2S.
Q18. The endpoint in acid-base titration is when:
- (A) Indicator changes colour
- (B) pH = 7 always
- (C) Gas evolves
- (D) Salt precipitates
Show Answer
(A)
Show Explanation
Endpoint detected by indicator colour change. :contentReference[oaicite:12]{index=12}
Q19. In salt analysis, Cl⁻ is confirmed by addition of:
- (A) AgNO3
- (B) BaCl2
- (C) NH4OH
- (D) KI
Show Answer
(A)
Show Explanation
AgNO3 gives white AgCl precipitate.
Q20. A test for carbonate ion is:
- (A) Lime water turns milky
- (B) Blue colour formation
- (C) Red litmus turns blue
- (D) No change
Show Answer
(A)
Show Explanation
CO2 from carbonate turns lime water milky.
👉 More Practical Chemistry NEET PYQs will be added gradually.