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s-Block Elements — NEET Chemistry Practice

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The s-Block Elements Revision Guide for NEET Chemistry

The s-Block Elements is part of NEET 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

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  • 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 The s-Block Elements

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Top 20 The s-Block Elements MCQs with Answers

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NEET Chemistry · The s-Block Elements · Very Hard

1. Which alkali metal has the highest first ionisation enthalpy?

  • A. Li
  • B. Na
  • C. K
  • D. Cs
Answer: A
Explanation: Ionisation enthalpy decreases down Group 1 because atomic size and shielding increase. Lithium therefore has the highest value.

NEET Chemistry · The s-Block Elements · Very Hard

2. Which alkali metal ion has the greatest hydration enthalpy magnitude?

  • A. Cs+
  • B. Li+
  • C. Na+
  • D. K+
Answer: B
Explanation: Li+ is the smallest alkali-metal ion and has the highest charge density, so it is hydrated most strongly.

NEET Chemistry · The s-Block Elements · Very Hard

3. Which alkali metal is the strongest reducing agent in aqueous solution?

  • A. K
  • B. Cs
  • C. Li
  • D. Na
Answer: C
Explanation: Despite its high ionisation enthalpy, lithium has exceptionally high hydration enthalpy, making its standard reduction potential most negative in aqueous solution.

NEET Chemistry · The s-Block Elements · Very Hard

4. Which alkali metal forms a normal oxide on combustion in excess oxygen?

  • A. Na
  • B. K
  • C. Rb
  • D. Li
Answer: D
Explanation: Lithium mainly forms Li2O; sodium forms peroxide, while heavier alkali metals favour superoxides.

NEET Chemistry · The s-Block Elements · Very Hard

5. Sodium burns in excess oxygen mainly to form:

  • A. Na2O2
  • B. Na2O
  • C. NaO2
  • D. Na2O3
Answer: A
Explanation: Sodium preferentially forms sodium peroxide, Na2O2, in excess oxygen.

NEET Chemistry · The s-Block Elements · Very Hard

6. Potassium burns in excess oxygen mainly to form:

  • A. K2O3
  • B. KO2
  • C. K2O
  • D. K2O2
Answer: B
Explanation: The large K+ ion stabilises the large superoxide ion O2−, giving KO2.

NEET Chemistry · The s-Block Elements · Very Hard

7. Which alkali-metal carbonate decomposes on heating?

  • A. K2CO3
  • B. Cs2CO3
  • C. Li2CO3
  • D. Na2CO3
Answer: C
Explanation: Lithium carbonate decomposes to Li2O and CO2 because small Li+ strongly polarises the carbonate ion.

NEET Chemistry · The s-Block Elements · Very Hard

8. Which alkali-metal nitrate gives the oxide on heating?

  • A. NaNO3
  • B. KNO3
  • C. RbNO3
  • D. LiNO3
Answer: D
Explanation: Lithium nitrate decomposes like alkaline-earth nitrates to Li2O, NO2 and O2. Other alkali nitrates mainly form nitrites and oxygen.

NEET Chemistry · The s-Block Elements · Very Hard

9. Lithium resembles magnesium mainly because of:

  • A. Diagonal relationship
  • B. Same group position
  • C. Equal atomic radius
  • D. Identical electronic configuration
Answer: A
Explanation: Similar ionic sizes, charge densities and polarising powers produce a diagonal relationship between Li and Mg.

NEET Chemistry · The s-Block Elements · Very Hard

10. Which statement about lithium is correct?

  • A. It is the least hydrated alkali-metal ion
  • B. It forms nitride directly with nitrogen
  • C. It forms a stable superoxide readily
  • D. Its carbonate is highly thermally stable
Answer: B
Explanation: Lithium directly forms Li3N with nitrogen, unlike the other alkali metals under ordinary conditions.

NEET Chemistry · The s-Block Elements · Very Hard

11. Which hydroxide is the strongest base?

  • A. KOH
  • B. CsOH
  • C. LiOH
  • D. NaOH
Answer: B
Explanation: Basic strength generally increases down Group 1 as the M–O bond becomes more ionic and dissociation becomes easier.

NEET Chemistry · The s-Block Elements · Very Hard

12. Which alkali-metal salt is sparingly soluble in water?

  • A. NaCl
  • B. KNO3
  • C. CsCl
  • D. LiF
Answer: D
Explanation: LiF has high lattice enthalpy that is not sufficiently offset by hydration enthalpy, making it sparingly soluble.

NEET Chemistry · The s-Block Elements · Very Hard

13. The characteristic flame colour of sodium is:

  • A. Golden yellow
  • B. Crimson red
  • C. Lilac
  • D. Brick red
Answer: A
Explanation: Sodium emits an intense golden-yellow flame due to electronic excitation and emission.

NEET Chemistry · The s-Block Elements · Very Hard

14. The characteristic flame colour of potassium is:

  • A. Apple green
  • B. Lilac
  • C. Golden yellow
  • D. Crimson red
Answer: B
Explanation: Potassium compounds impart a lilac or pale-violet colour to a flame.

NEET Chemistry · The s-Block Elements · Very Hard

15. Which alkaline-earth metal does not impart a characteristic colour to the flame?

  • A. Sr
  • B. Ba
  • C. Be
  • D. Ca
Answer: C
Explanation: Beryllium atoms have high excitation energies and do not give a characteristic flame colour.

NEET Chemistry · The s-Block Elements · Very Hard

16. Which alkaline-earth metal has the highest first ionisation enthalpy?

  • A. Mg
  • B. Ca
  • C. Ba
  • D. Be
Answer: D
Explanation: Ionisation enthalpy decreases down Group 2, so beryllium has the highest value.

NEET Chemistry · The s-Block Elements · Very Hard

17. Which alkaline-earth hydroxide is least soluble in water?

  • A. Be(OH)2
  • B. Mg(OH)2
  • C. Ca(OH)2
  • D. Ba(OH)2
Answer: A
Explanation: Hydroxide solubility generally increases down Group 2. Be(OH)2 is amphoteric and least soluble.

NEET Chemistry · The s-Block Elements · Very Hard

18. Which alkaline-earth sulphate is most soluble in water?

  • A. BaSO4
  • B. BeSO4
  • C. MgSO4
  • D. CaSO4
Answer: B
Explanation: Sulphate solubility decreases down Group 2 because hydration enthalpy decreases more rapidly than lattice enthalpy.

NEET Chemistry · The s-Block Elements · Very Hard

19. Which alkaline-earth carbonate is most thermally stable?

  • A. MgCO3
  • B. BeCO3
  • C. BaCO3
  • D. CaCO3
Answer: C
Explanation: Thermal stability increases down Group 2 as the polarising power of the cation decreases.

NEET Chemistry · The s-Block Elements · Very Hard

20. Which compound is used in the Solvay process as a source of carbon dioxide and calcium oxide?

  • A. NaCl
  • B. NH3
  • C. CaCl2
  • D. CaCO3
Answer: D
Explanation: Limestone, CaCO3, is calcined to produce CaO and CO2 in the Solvay process.

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The s-Block Elements Practice Tests

The s-Block Elements Frequently Asked Questions

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