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Principles of Qualitative Analysis WBJEE MCQ & Practice Questions

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Principles of Qualitative Analysis Revision Guide for WBJEE Chemistry

Principles of Qualitative Analysis is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

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What to practise in Principles of Qualitative Analysis

Concept Revision

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Exam-style MCQs

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Top 20 Principles of Qualitative Analysis MCQs with Answers

These public questions are selected from the exact Principles of Qualitative Analysis chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

1. In qualitative inorganic analysis, group separation of cations is primarily based on:

  • A. Colours only
  • B. Boiling points
  • C. Differences in solubility products and complex formation
  • D. Atomic masses only
Answer: C
Explanation: Selective precipitation and complex equilibria permit systematic group separation.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

2. Group I cations are precipitated by dilute HCl mainly as:

  • A. Carbonates
  • B. Chlorides
  • C. Sulfides
  • D. Hydroxides
Answer: B
Explanation: Ag+, Pb2+ and Hg2^2+ form sparingly soluble chlorides.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

3. Which ion belongs to the classical Group I cations?

  • A. Ag+
  • B. Fe3+
  • C. Zn2+
  • D. Ba2+
Answer: A
Explanation: Silver ion precipitates as AgCl with dilute HCl.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

4. AgCl precipitate is:

  • A. Black
  • B. Yellow
  • C. Brown
  • D. White
Answer: D
Explanation: Silver chloride forms a curdy white precipitate.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

5. AgCl dissolves in aqueous ammonia due to formation of:

  • A. AgH
  • B. AgNO3 directly
  • C. [Ag(NH3)2]+
  • D. Ag2O
Answer: C
Explanation: Diamminesilver(I) complex formation dissolves AgCl.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

6. PbCl2 is appreciably more soluble in:

  • A. Ether
  • B. Hot water
  • C. Cold water
  • D. Concentrated NH3 only
Answer: B
Explanation: Lead(II) chloride solubility increases significantly with temperature.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

7. Passing H2S in acidic medium precipitates Group II cations because:

  • A. S2- concentration remains low but sufficient for very insoluble sulfides
  • B. All sulfides are equally soluble
  • C. H2S is a strong base
  • D. Chlorides precipitate
Answer: A
Explanation: Acidity suppresses H2S ionisation, allowing only very insoluble sulfides to precipitate.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

8. CuS precipitate is commonly:

  • A. White
  • B. Yellow
  • C. Pink
  • D. Black
Answer: D
Explanation: Copper(II) sulfide is black.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

9. CdS precipitate is characteristically:

  • A. White
  • B. Blue
  • C. Yellow
  • D. Black
Answer: C
Explanation: Cadmium sulfide is yellow.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

10. As2S3 precipitate is commonly:

  • A. Green
  • B. Yellow
  • C. Black
  • D. White
Answer: B
Explanation: Arsenic(III) sulfide is yellow.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

11. Group II sulfides are traditionally subdivided using solubility in:

  • A. Yellow ammonium sulfide
  • B. Dilute HCl only
  • C. Water
  • D. NaCl solution
Answer: A
Explanation: Certain sulfides dissolve through thio-complex formation while others remain insoluble.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

12. Fe3+ with thiocyanate gives a characteristic:

  • A. Blue precipitate
  • B. Green gas
  • C. White precipitate
  • D. Blood-red complex
Answer: D
Explanation: Ferric thiocyanate complexes produce an intense red colour.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

13. Fe2+ can be distinguished from Fe3+ because Fe2+ is more readily:

  • A. Precipitated as chloride
  • B. Converted to noble gas
  • C. Oxidised to Fe3+
  • D. Reduced to Fe metal only
Answer: C
Explanation: Ferrous ion is readily oxidised to ferric ion.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

14. Al3+ gives a white gelatinous precipitate with OH- identified as:

  • A. AlH3
  • B. Al(OH)3
  • C. AlCl3
  • D. Al2S3
Answer: B
Explanation: Aluminium hydroxide is white and gelatinous.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

15. Al(OH)3 dissolves in excess NaOH because it is:

  • A. Amphoteric
  • B. Strongly acidic only
  • C. Strongly basic only
  • D. A noble compound
Answer: A
Explanation: Aluminium hydroxide forms soluble aluminate species in excess base.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

16. Cr3+ hydroxide is typically:

  • A. Bright red
  • B. Black
  • C. Colourless gas
  • D. Greenish
Answer: D
Explanation: Chromium(III) hydroxide is generally grey-green/green.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

17. Zn2+ with NaOH initially forms:

  • A. ZnCl2
  • B. Zn metal
  • C. Zn(OH)2
  • D. ZnS directly
Answer: C
Explanation: Hydroxide precipitates zinc hydroxide.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

18. Zn(OH)2 dissolves in excess NaOH because it is:

  • A. Inert
  • B. Amphoteric
  • C. Only acidic
  • D. Only basic
Answer: B
Explanation: Zinc hydroxide forms soluble zincate/hydroxo complexes.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

19. Ni2+ gives a characteristic red precipitate with:

  • A. Dimethylglyoxime
  • B. Thiourea
  • C. Benedict reagent
  • D. Tollens reagent
Answer: A
Explanation: Nickel forms the red bis(dimethylglyoximato) complex.

WBJEE Chemistry · Principles of Qualitative Analysis · Very Very Hard

20. Co2+ compounds often show characteristic:

  • A. Only colourless behaviour
  • B. Only yellow precipitates
  • C. No complex formation
  • D. Pink/blue colour changes depending on ligation
Answer: D
Explanation: Cobalt(II) complexes display strong ligand-dependent colours.

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Principles of Qualitative Analysis Practice Tests

Principles of Qualitative Analysis Frequently Asked Questions

How should I prepare Principles of Qualitative Analysis for WBJEE Chemistry?

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