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CBSE Class 11 Chemistry – s-Block Elements MCQs with Answers
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Introduction
Prepare effectively for your CBSE Class 11 Chemistry exams with this exclusive set of NCERT-based MCQs on Chapter 10 – The s-Block Elements (Alkali and Alkaline Earth Metals). This online practice test focuses on the physical and chemical properties of Group 1 and Group 2 elements — including their atomic structure, reactivity, oxides, hydroxides, and trends in solubility and ionization enthalpy.
These CBSE Class 11 Chemistry s-Block Elements MCQs are designed to strengthen your conceptual understanding and help you tackle board exam-style questions confidently. Each question comes with detailed explanations and correct answers, making this quiz perfect for self-assessment and revision.
Covering important topics like metallic character, flame test colours, thermal stability, and hydration energies, this quiz ensures comprehensive coverage of the NCERT syllabus. Attempt the test within a 30-minute timer and check your performance instantly — a smart way to practice for your final exams!
Sample MCQs (with Answers and Explanations):
Q1. Which alkali metal has the highest atomic radius?
A) Lithium
B) Sodium
C) Potassium
D) Cesium
Answer: D) Cesium
Explanation: Atomic radius increases down the group; cesium, being lowest in Group 1, has the largest atomic radius.
Q2. Which oxide of the s-block elements is amphoteric in nature?
A) BeO
B) MgO
C) Na2O
D) CaO
Answer: A) BeO
Explanation: Beryllium oxide reacts with both acids and bases, showing amphoteric character, unlike other basic oxides.
Q3. Which alkaline earth metal forms peroxide most readily?
A) Mg
B) Ca
C) Sr
D) Ba
Answer: D) Ba
Explanation: Barium forms BaO₂ easily because larger cations stabilize the peroxide ion more effectively.
Q4. Why does the basic strength of hydroxides increase down Group 2?
A) Atomic mass increases
B) Solubility increases
C) Ionic size decreases
D) Lattice energy increases
Answer: B) Solubility increases
Explanation: Down the group, hydroxides become more soluble in water, increasing their basic strength.
Q5. Which alkaline earth metal carbonate decomposes most easily on heating?
A) BeCO₃
B) MgCO₃
C) CaCO₃
D) BaCO₃
Answer: A) BeCO₃
Explanation: Smaller Be²⁺ ion has higher polarizing power, weakening the carbonate bond, leading to easier decomposition.