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s-Block Elements (Alkali and Alkaline Earth Metals) JENPAS MCQ & Practice Questions

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s-Block Elements (Alkali and Alkaline Earth Metals) Revision Guide for JENPAS Chemistry

s-Block Elements (Alkali and Alkaline Earth Metals) is part of JENPAS 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

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What to practise in s-Block Elements (Alkali and Alkaline Earth Metals)

Concept Revision

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Top 20 s-Block Elements (Alkali and Alkaline Earth Metals) MCQs with Answers

These public questions are selected from the exact s-Block Elements (Alkali and Alkaline Earth Metals) 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.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · 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 electron in an s orbital.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · 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 electrons in an s orbital.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

3. The common oxidation state of alkali metals is:

  • A. +1
  • B. +2
  • C. +3
  • D. -1
Answer: A
Explanation: Alkali metals lose one valence electron to form M+.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · 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 to form M2+.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

5. Down Group 1, atomic radius generally:

  • A. Remains constant
  • B. Becomes zero
  • C. Increases
  • D. Decreases
Answer: C
Explanation: A new electron shell is added down the group.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

6. Down Group 1, first ionisation enthalpy generally:

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

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

7. Down Group 2, metallic character generally:

  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Disappears
Answer: A
Explanation: Larger atoms lose electrons more readily.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

8. Lithium shows a diagonal relationship with:

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

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

9. Beryllium shows a diagonal relationship with:

  • A. Boron
  • B. Calcium
  • C. Aluminium
  • D. Magnesium
Answer: C
Explanation: Be and Al exhibit analogous properties.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

10. Lithium differs from other alkali metals mainly because of its:

  • A. d10 configuration
  • B. Small size and high polarising power
  • C. Very large size
  • D. Low charge density
Answer: B
Explanation: The small Li+ ion causes anomalous behaviour.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

11. 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.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

12. 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: The ease of losing the valence electron increases down the group.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

13. 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.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

14. Calcium reacts with cold 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.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

15. Lithium directly reacts with nitrogen to form:

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

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

16. On combustion in oxygen, lithium mainly forms:

  • A. Li2O2 only
  • B. LiO2
  • C. Li2O3
  • D. Li2O
Answer: D
Explanation: Lithium preferentially forms the normal oxide.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

17. Sodium in excess oxygen commonly forms:

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

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

18. Potassium in excess oxygen readily forms:

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

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

19. The stability of alkali-metal superoxides generally:

  • A. Increases down the group
  • B. Decreases down the group
  • C. Remains constant
  • D. Is maximum for Li
Answer: A
Explanation: Larger cations stabilise the large O2- ion more effectively.

JENPAS Chemistry · s-Block Elements (Alkali and Alkaline Earth Metals) · Very Very Hard

20. Lithium carbonate on heating gives:

  • A. Li metal and O2
  • B. LiOH only
  • C. LiH and CO
  • D. Li2O and CO2
Answer: D
Explanation: Li2CO3 decomposes unlike most other alkali carbonates.

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s-Block Elements (Alkali and Alkaline Earth Metals) Practice Tests

s-Block Elements (Alkali and Alkaline Earth Metals) Frequently Asked Questions

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