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s-Block Elements (Group 1 and Group 2) WBJEE MCQ & Practice Questions

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s-Block Elements (Group 1 and Group 2) Revision Guide for WBJEE Chemistry

s-Block Elements (Group 1 and Group 2) 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 equations or relationships
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  • Error review and targeted revision

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Top 20 s-Block Elements (Group 1 and Group 2) MCQs with Answers

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WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very 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 valence s electron.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very 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 possess two valence s electrons.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

3. Among Li, Na, K and Rb, the largest atomic radius is:

  • A. Rb
  • B. K
  • C. Na
  • D. Li
Answer: A
Explanation: Atomic radius increases down Group 1.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

4. The first ionisation enthalpy generally down Group 1:

  • A. Increases
  • B. Remains constant
  • C. Becomes zero
  • D. Decreases
Answer: D
Explanation: Increasing size and shielding lower first ionisation enthalpy down the group.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

5. Alkali metals predominantly form ions with charge:

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

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

6. Alkaline earth metals predominantly form ions with charge:

  • A. -2
  • B. +2
  • C. +1
  • D. +3
Answer: B
Explanation: Loss of two ns electrons gives M2+.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

7. Lithium differs from other alkali metals partly because of its:

  • A. Small size and high polarising power
  • B. Very large size
  • C. Lowest charge density
  • D. d10 configuration
Answer: A
Explanation: Lithium's small Li+ ion produces several anomalous properties.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

8. The diagonal relationship of lithium is most pronounced with:

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

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

9. The diagonal relationship of beryllium is most pronounced with:

  • A. Lithium
  • B. Sodium
  • C. Aluminium
  • D. Magnesium
Answer: C
Explanation: Be and Al exhibit several analogous chemical behaviours.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

10. When sodium reacts with water, a principal product besides H2 is:

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

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

11. Potassium reacts with water generally:

  • A. More vigorously than sodium
  • B. Less vigorously than lithium
  • C. Not at all
  • D. Only above 500 °C
Answer: A
Explanation: Group 1 reactivity with water generally increases down the group.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

12. Lithium on combustion in oxygen mainly forms:

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

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

13. Sodium on combustion in excess oxygen commonly forms:

  • A. NaO2 exclusively
  • B. Na2O3
  • C. Na2O2
  • D. Na2O only
Answer: C
Explanation: Sodium characteristically forms peroxide under suitable conditions.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

14. Potassium in excess oxygen readily forms:

  • A. K2O3
  • B. KO2
  • C. K2O only
  • D. K2O2 exclusively
Answer: B
Explanation: The larger K+ ion stabilises the superoxide anion.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

15. The stability of alkali-metal superoxides generally increases:

  • A. Down the group
  • B. Up the group
  • C. Randomly
  • D. Only from K to Na
Answer: A
Explanation: Larger cations stabilise the large superoxide anion more effectively.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

16. Lithium directly combines with nitrogen to form:

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

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

17. On strong heating, Li2CO3 decomposes to give:

  • A. LiOH only
  • B. LiH and CO
  • C. Li2O and CO2
  • D. Li metal and O2
Answer: C
Explanation: Lithium carbonate resembles MgCO3 in thermal decomposition.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

18. Most other alkali-metal carbonates compared with Li2CO3 are:

  • A. Insoluble in water in every case
  • B. More thermally stable
  • C. Less thermally stable
  • D. Explosive at room temperature
Answer: B
Explanation: Carbonates of Na, K etc. are comparatively thermally stable.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

19. LiNO3 on heating gives mainly Li2O, NO2 and:

  • A. O2
  • B. H2
  • C. N2
  • D. NH3
Answer: A
Explanation: Lithium nitrate decomposes similarly to Group 2 nitrates.

WBJEE Chemistry · s-Block Elements (Group 1 and Group 2) · Very Very Hard

20. NaNO3 on heating gives NaNO2 and:

  • A. NO2 only
  • B. N2
  • C. H2
  • D. O2
Answer: D
Explanation: Most alkali nitrates form nitrites plus oxygen on heating.

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