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NCERT-Based Class 11 Chemistry MCQs on s-Block Elements and Their Reactions
Introduction
Sharpen your understanding of s-Block Reactions and Comparisons with this CBSE Class 11 Chemistry MCQ Practice Test, crafted strictly according to the NCERT syllabus. This test covers key concepts from Chapter 10 – The s-Block Elements (Alkali and Alkaline Earth Metals), focusing on reaction trends, reactivity order, solubility patterns, and compound formation.
These Inorganic Chemistry MCQs help students compare the behavior of Group 1 and Group 2 elements — such as their reaction with water, oxygen, acids, and salts. Important topics like formation of oxides, hydroxides, carbonates, and thermal stability trends are included to reinforce conceptual clarity.
Each question is followed by accurate answers and detailed explanations to ensure strong conceptual retention. Ideal for CBSE board exam preparation, JEE foundation, and NEET aspirants, this quiz is perfect for self-assessment and timed practice. Test yourself, review your performance instantly, and strengthen your command over the s-Block elements — one of the most fundamental topics in Class 11 Chemistry.
Sample MCQs (with Answers and Explanations):
Q1. Which of the following metals reacts most vigorously with water?
A) Lithium
B) Sodium
C) Potassium
D) Rubidium
Answer: C) Potassium
Explanation: Reactivity increases down Group 1. Potassium reacts explosively with water, producing KOH and hydrogen gas.
Q2. The reaction of calcium with water can be represented as:
A) Ca + 2H₂O → Ca(OH)₂ + H₂
B) Ca + H₂O → CaH₂ + O₂
C) Ca + H₂O → CaO + H₂
D) 2Ca + 2H₂O → 2Ca(OH)₂
Answer: A) Ca + 2H₂O → Ca(OH)₂ + H₂
Explanation: Calcium reacts slowly with cold water to produce calcium hydroxide and hydrogen gas.
Q3. Which of the following oxides is amphoteric in nature?
A) BeO
B) MgO
C) CaO
D) SrO
Answer: A) BeO
Explanation: Beryllium oxide reacts with both acids and bases, showing amphoteric behavior — a unique property of Be among Group 2 elements.
Q4. Which compound shows the greatest thermal stability?
A) BeCO₃
B) MgCO₃
C) CaCO₃
D) SrCO₃
Answer: D) SrCO₃
Explanation: Thermal stability of carbonates increases down the group due to decreasing cation polarizing power, making SrCO₃ most stable.
Q5. Which compound forms a white precipitate when Na₂CO₃ is added to CaCl₂ solution?
A) NaCl
B) CaCO₃
C) Na₂SO₄
D) Ca(OH)₂
Answer: B) CaCO₃
Explanation: Calcium carbonate (CaCO₃) is insoluble in water and precipitates out when Na₂CO₃ reacts with CaCl₂.