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s-Block Elements WBJEE MCQ & Practice Questions

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s-Block Elements Revision Guide for WBJEE Chemistry

s-Block Elements 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.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

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

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for s-Block Elements, then test recall with mixed MCQs.

What to practise in s-Block Elements

Concept Revision

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Exam-style MCQs

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Performance Practice

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Top 20 s-Block Elements MCQs with Answers

These public questions are selected from the exact s-Block Elements 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 · s-Block Elements · Very Very Hard

1. The most electropositive metals are generally found toward the:

  • A. Centre of p-block only
  • B. Noble-gas column
  • C. Lower left of the periodic table
  • D. Upper right
Answer: C
Explanation: Metallic character and electropositivity increase down groups and toward the left.

WBJEE Chemistry · s-Block Elements · Very Very Hard

2. Metals generally tend to form cations by:

  • A. Gaining protons
  • B. Losing electrons
  • C. Gaining electrons
  • D. Sharing neutrons
Answer: B
Explanation: Low ionisation enthalpy favours electron loss.

WBJEE Chemistry · s-Block Elements · Very Very Hard

3. The common oxidation state of alkali metals is:

  • A. +1
  • B. +2
  • C. +3
  • D. -1
Answer: A
Explanation: Group 1 metals lose one valence electron.

WBJEE Chemistry · s-Block Elements · Very Very Hard

4. The common oxidation state of alkaline earth metals is:

  • A. +1
  • B. +3
  • C. -2
  • D. +2
Answer: D
Explanation: Group 2 metals lose two valence electrons.

WBJEE Chemistry · s-Block Elements · Very Very Hard

5. Lithium shows a diagonal relationship with:

  • A. Beryllium
  • B. Calcium
  • C. Magnesium
  • D. Sodium
Answer: C
Explanation: Li resembles Mg in several properties due to similar charge density.

WBJEE Chemistry · s-Block Elements · Very Very Hard

6. Beryllium shows a diagonal relationship with:

  • A. Calcium
  • B. Aluminium
  • C. Magnesium
  • D. Boron
Answer: B
Explanation: Be and Al display several analogous chemical behaviours.

WBJEE Chemistry · s-Block Elements · Very Very Hard

7. Alkali metals are strong reducing agents because they:

  • A. Lose electrons readily
  • B. Gain electrons readily
  • C. Have high electronegativity
  • D. Are noble gases
Answer: A
Explanation: Their low ionisation enthalpies favour oxidation.

WBJEE Chemistry · s-Block Elements · Very Very Hard

8. Reactivity of alkali metals with water generally:

  • A. Decreases down the group
  • B. Remains constant
  • C. Is zero
  • D. Increases down the group
Answer: D
Explanation: Ionisation enthalpy decreases and metallic character increases down Group 1.

WBJEE Chemistry · s-Block Elements · Very Very Hard

9. Sodium reacts with water to form:

  • A. NaH and O2
  • B. NaCl
  • C. NaOH and H2
  • D. Na2O only
Answer: C
Explanation: 2Na + 2H2O → 2NaOH + H2.

WBJEE Chemistry · s-Block Elements · Very Very Hard

10. Calcium reacts with water to form:

  • A. CaCl2
  • B. Ca(OH)2 and H2
  • C. CaO only
  • D. CaH2 and O2
Answer: B
Explanation: Ca + 2H2O → Ca(OH)2 + H2.

WBJEE Chemistry · s-Block Elements · Very Very Hard

11. The flame colour of sodium salts is:

  • A. Golden yellow
  • B. Brick red
  • C. Lilac
  • D. Apple green
Answer: A
Explanation: Sodium gives an intense yellow flame.

WBJEE Chemistry · s-Block Elements · Very Very Hard

12. Potassium salts impart which flame colour?

  • A. Golden yellow
  • B. Brick red
  • C. Blue-green
  • D. Lilac
Answer: D
Explanation: Potassium gives a lilac flame.

WBJEE Chemistry · s-Block Elements · Very Very Hard

13. Calcium salts commonly give a:

  • A. Golden-yellow flame
  • B. Blue flame
  • C. Brick-red flame
  • D. Lilac flame
Answer: C
Explanation: Calcium gives an orange-red/brick-red flame.

WBJEE Chemistry · s-Block Elements · Very Very Hard

14. Barium salts commonly give a:

  • A. Brick-red flame
  • B. Apple-green flame
  • C. Golden-yellow flame
  • D. Lilac flame
Answer: B
Explanation: Barium produces an apple-green flame.

WBJEE Chemistry · s-Block Elements · Very Very Hard

15. The solubility of Group 2 hydroxides generally:

  • A. Increases down the group
  • B. Decreases down the group
  • C. Remains constant
  • D. Becomes zero
Answer: A
Explanation: Lattice-energy decrease dominates down the group.

WBJEE Chemistry · s-Block Elements · Very Very Hard

16. The solubility of Group 2 sulfates generally:

  • A. Increases down the group
  • B. Remains constant
  • C. All are insoluble
  • D. Decreases down the group
Answer: D
Explanation: Hydration enthalpy decreases significantly down the group.

WBJEE Chemistry · s-Block Elements · Very Very Hard

17. Thermal stability of Group 2 carbonates generally:

  • A. Is constant
  • B. Becomes zero
  • C. Increases down the group
  • D. Decreases down the group
Answer: C
Explanation: Larger cations polarise carbonate less strongly.

WBJEE Chemistry · s-Block Elements · Very Very Hard

18. Aluminium oxide is:

  • A. Neutral
  • B. Amphoteric
  • C. Strongly acidic only
  • D. Strongly basic only
Answer: B
Explanation: Al2O3 reacts with both acids and bases.

WBJEE Chemistry · s-Block Elements · Very Very Hard

19. Aluminium hydroxide is:

  • A. Amphoteric
  • B. Only acidic
  • C. Only basic
  • D. Neutral
Answer: A
Explanation: Al(OH)3 dissolves in both acids and strong bases.

WBJEE Chemistry · s-Block Elements · Very Very Hard

20. Aluminium is protected from rapid corrosion by:

  • A. A chloride film
  • B. A sulfide film
  • C. A nitrate film
  • D. A thin oxide film
Answer: D
Explanation: Compact Al2O3 passivates the surface.

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s-Block Elements Practice Tests

s-Block Elements Frequently Asked Questions

How should I prepare s-Block Elements for WBJEE Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with s-Block Elements practice?

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What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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