NeetVictoryQuestion 1: Alkali Metals: Group 1
Which of these alkali metals reacts most vigorously with water?
- A sodium
- B lithium
- C potassium
- D caesium
Answer: D. caesium
Why: Reactivity increases down the group as ionisation enthalpy decreases.
NEET Chemistry: s-Block Elements. Chapter-wise Practice Questions and Test
s-Block Elements is a Class 11 Chemistry chapter that carries about 2.0% of the Chemistry questions in NEET. Practise it with 38 questions covering 3 topics, each with an explanation.
Practise s-Block Elements
Open in the appSets of 15 questions that adapt to your level, with an explanation for every answer.
Topics covered in s-Block Elements
- Alkali Metals: Group 1 (17 questions)
- Alkaline Earth Metals: Group 2 (10 questions)
- Important Compounds of Sodium and Calcium (11 questions)
How often s-Block Elements has come up in NEET
Across the 13 previous year papers, s-Block Elements had 14 questions, about 1.1 a year. The most in one paper was 2, in NEET 2016.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 1 |
| NEET 2025 | 0 |
| NEET 2024 | 0 |
| NEET 2023 | 2 |
| NEET 2022 | 2 |
| NEET 2021 | 2 |
| NEET 2020 | 1 |
| NEET 2019 | 2 |
| NEET 2018 | 1 |
| NEET 2017 | 0 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 0 |
Sample questions on s-Block Elements with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 2: Alkaline Earth Metals: Group 2
Magnesium burns in air to give:
- A magnesium carbonate
- B only magnesium hydroxide
- C magnesium peroxide
- D magnesium oxide and magnesium nitride
Answer: D. magnesium oxide and magnesium nitride
Why: The nitride hydrolyses to give ammonia.
Question 3: Important Compounds of Sodium and Calcium
On heating, sodium bicarbonate (baking soda) gives:
- A sodium hydroxide and carbon dioxide
- B sodium metal and oxygen
- C sodium oxide and carbon dioxide
- D sodium carbonate, carbon dioxide and water
Answer: D. sodium carbonate, carbon dioxide and water
Why: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂.
Question 4: Alkali Metals: Group 1
Sodium hydroxide is manufactured industrially by the:
- A Castner–Kellner process (electrolysis of brine using a mercury cathode)
- B Haber process
- C Solvay process
- D contact process
Answer: A. Castner–Kellner process (electrolysis of brine using a mercury cathode)
Why: Electrolysis of brine gives sodium amalgam at the cathode, which reacts with water to give NaOH.
Question 5: Alkaline Earth Metals: Group 2
The correct order of the thermal stability of the carbonates of Group 2 is:
- A BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ < BaCO₃
- B all are equally stable
- C BaCO₃ < SrCO₃ < CaCO₃ < MgCO₃ < BeCO₃
- D MgCO₃ < BeCO₃ < CaCO₃
Answer: A. BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ < BaCO₃
Why: Small cations polarise the carbonate ion, which decomposes more readily.
Question 6: Important Compounds of Sodium and Calcium
Caustic soda is:
- A NaOH
- B Na₂O₂
- C NaHCO₃
- D Na₂CO₃
Answer: A. NaOH
Why: It is a strong base that absorbs CO₂ and moisture from air.
Question 7: Alkali Metals: Group 1
The correct order of the hydration enthalpies of the alkali metal ions is:
- A Na⁺ > Li⁺ > K⁺ > Rb⁺ > Cs⁺
- B Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺
- C Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
- D all are equal
Answer: C. Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
Why: Smaller ions attract water more strongly.
Question 8: Alkaline Earth Metals: Group 2
Magnesium plays an important biological role in:
- A DNA bases
- B haemoglobin
- C chlorophyll, and as a cofactor of enzymes using ATP
- D insulin
Answer: C. chlorophyll, and as a cofactor of enzymes using ATP
Why: Calcium is needed for bones, blood clotting and muscle contraction.
Practise all of s-Block Elements
Open in the appFrequently asked questions
How many questions come from s-Block Elements in NEET?
s-Block Elements carries about 2.0% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 14 times, about 1.1 questions a year.
Which class is s-Block Elements from?
s-Block Elements is a Class 11 Chemistry chapter in the NCERT syllabus.
Where can I practise s-Block Elements questions for NEET?
NeetVictory has 38 practice questions on s-Block Elements, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.