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s-Block Elements WBCHSE Class 11 MCQ & Practice Questions

Practice s-Block Elements MCQs for WBCHSE Class 11 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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s-Block Elements Revision Guide for WBCHSE Class 11 Chemistry

s-Block Elements is part of WBCHSE Class 11 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 s-Block Elements

Concept Revision

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Exam-style MCQs

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Top 20 s-Block Elements MCQs with Answers

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WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

1. The general valence-shell configuration of alkali metals is:

  • A. ns2np1
  • B. ns2np5
  • C. ns1
  • D. ns2
Answer: C
Explanation: Group 1 elements possess one electron in the outermost s orbital.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

2. The general valence-shell configuration of alkaline earth metals is:

  • A. ns2np6
  • B. ns2
  • C. ns1
  • D. ns2np2
Answer: B
Explanation: Group 2 elements have two electrons in the outermost s orbital.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

3. The most common oxidation state of alkali metals is:

  • A. +1
  • B. +2
  • C. +3
  • D. -1
Answer: A
Explanation: Loss of the single ns electron gives the stable +1 state.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

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

  • A. +1
  • B. +3
  • C. -2
  • D. +2
Answer: D
Explanation: Loss of both ns electrons gives the common +2 oxidation state.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

5. Down Group 1, atomic radius generally:

  • A. Remains constant
  • B. First becomes zero
  • C. Increases
  • D. Decreases
Answer: C
Explanation: Addition of electron shells increases atomic size down the group.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

6. Down Group 2, first ionisation enthalpy generally:

  • A. Becomes zero
  • B. Decreases
  • C. Increases
  • D. Remains constant
Answer: B
Explanation: Increasing size and shielding make electron removal easier.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

7. Among alkali metal ions, the smallest is:

  • A. Li+
  • B. Na+
  • C. K+
  • D. Cs+
Answer: A
Explanation: Ionic radius increases down the group.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

8. Alkali metals are strong reducing agents because they:

  • A. Gain electrons readily
  • B. Have filled p shells
  • C. Are highly electronegative
  • D. Lose their valence electron readily
Answer: D
Explanation: Their low ionisation enthalpies favour electron loss.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

9. Alkali metals are generally stored under kerosene because they:

  • A. React with nitrogen only
  • B. Are nonreactive solids
  • C. React readily with air and moisture
  • D. Are insoluble in kerosene only
Answer: C
Explanation: Isolation from oxygen and water prevents vigorous reactions.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

10. Reaction of sodium with water produces:

  • A. Na2CO3 and H2
  • B. NaOH and H2
  • C. Na2O and O2
  • D. NaH and O2
Answer: B
Explanation: 2Na + 2H2O gives 2NaOH + H2.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

11. Lithium reacts with nitrogen directly to form:

  • A. Li3N
  • B. LiN3
  • C. Li2N
  • D. LiNO3
Answer: A
Explanation: Lithium uniquely forms stable lithium nitride readily.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

12. On combustion in oxygen, lithium mainly forms:

  • A. Li2O2
  • B. LiO2
  • C. LiO3
  • D. Li2O
Answer: D
Explanation: Lithium preferentially forms the normal oxide.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

13. Sodium on reaction with excess oxygen commonly forms:

  • A. NaO2 only
  • B. Na2O3
  • C. Na2O2
  • D. Na2O only
Answer: C
Explanation: Sodium characteristically forms sodium peroxide.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

14. Potassium in excess oxygen commonly forms:

  • A. K2O3
  • B. KO2
  • C. K2O only
  • D. K2O2 only
Answer: B
Explanation: Larger alkali metals stabilise the superoxide ion.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

15. The stability of alkali-metal superoxides increases down the group mainly because:

  • A. Larger cations stabilise the large O2- ion
  • B. Ionisation enthalpy increases
  • C. Atomic radius decreases
  • D. Electronegativity increases
Answer: A
Explanation: Large low-charge-density cations better stabilise large polarizable anions.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

16. Lithium shows a diagonal relationship with:

  • A. Calcium
  • B. Sodium
  • C. Beryllium
  • D. Magnesium
Answer: D
Explanation: Li and Mg show similarities due to comparable charge density and polarising power.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

17. A similarity between Li and Mg is that both form nitrides directly with:

  • A. Hydrogen only
  • B. Carbon dioxide
  • C. Nitrogen
  • D. Chlorine
Answer: C
Explanation: Both Li and Mg combine directly with nitrogen to form nitrides.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

18. Lithium carbonate differs from other alkali carbonates because it:

  • A. Forms superoxide
  • B. Decomposes appreciably on heating
  • C. Is exceptionally thermally stable
  • D. Is highly soluble compared with all others
Answer: B
Explanation: Li2CO3 decomposes to Li2O and CO2 on heating.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

19. The solubility of Group 2 hydroxides generally:

  • A. Increases down the group
  • B. Decreases down the group
  • C. Remains constant
  • D. Is zero for all
Answer: A
Explanation: Lattice and hydration effects lead to increasing hydroxide solubility down Group 2.

WBCHSE Class 11 Chemistry · s-Block Elements · Very Hard

20. The solubility of Group 2 sulfates generally:

  • A. Increases down the group
  • B. Remains constant
  • C. Is identical for all
  • D. Decreases down the group
Answer: D
Explanation: Hydration enthalpy falls markedly down the group, reducing sulfate solubility.

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s-Block Elements Frequently Asked Questions

How should I prepare s-Block Elements for WBCHSE Class 11 Chemistry?

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