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CBSE Class 11 Chemistry – The s-Block Elements: Biological Importance and Uses MCQs
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NCERT-Based Class 11 Chemistry MCQs on s-Block Elements and Their Applications
Introduction
Enhance your understanding of The s-Block Elements – Biological Importance and Uses with this CBSE Class 11 Chemistry MCQ Practice Test. This topic, from Inorganic Chemistry Chapter 10 (The s-Block Elements), explores the vital roles and applications of alkali metals (Group 1) and alkaline earth metals (Group 2) in daily life and biological systems.
These NCERT-based multiple-choice questions focus on how essential ions like Na⁺, K⁺, Ca²⁺, and Mg²⁺ contribute to biological functions such as nerve impulse transmission, bone formation, enzyme activity, and muscle contraction. The quiz also highlights the industrial and medicinal uses of important compounds like NaHCO₃ (baking soda), CaCO₃ (antacid and supplement), and Mg(OH)₂ (milk of magnesia).
Each MCQ includes instant feedback and detailed explanations to improve conceptual clarity. Perfect for CBSE board exam preparation, JEE, and NEET foundation, this test follows the latest NCERT Class 11 Chemistry syllabus and ensures comprehensive revision of the topic.
Sample MCQs (with Answers and Explanations):
Q1. Which calcium compound is essential for the formation of bones and teeth in humans?
A) CaO
B) CaCO₃
C) Ca(OH)₂
D) CaCl₂
Answer: B) CaCO₃
Explanation: Calcium carbonate (CaCO₃) is a major structural component of bones and teeth, providing rigidity and strength.
Q2. Which magnesium compound is commonly known as milk of magnesia and used as an antacid?
A) MgCO₃
B) Mg(OH)₂
C) MgSO₄·7H₂O
D) MgCl₂
Answer: B) Mg(OH)₂
Explanation: Magnesium hydroxide (Mg(OH)₂) neutralizes stomach acid and relieves indigestion, making it a popular antacid.
Q3. Sodium ions play a vital role in which biological process?
A) DNA replication
B) Muscle contraction and nerve impulse transmission
C) Blood coagulation
D) Photosynthesis
Answer: B) Muscle contraction and nerve impulse transmission
Explanation: Sodium (Na⁺) and potassium (K⁺) ions regulate electrical impulses in nerves and muscles, maintaining proper body function.
Q4. Which potassium compound is used as a fertilizer due to its high potassium content?
A) KNO₃
B) KCl
C) K₂CO₃
D) KOH
Answer: B) KCl
Explanation: Potassium chloride (KCl) is a major potash fertilizer that provides essential potassium for plant growth and metabolism.
Q5. Which magnesium compound is used in medicine as Epsom salt?
A) MgCl₂
B) MgSO₄·7H₂O
C) MgCO₃
D) Mg(OH)₂
Answer: B) MgSO₄·7H₂O
Explanation: Epsom salt, or magnesium sulfate heptahydrate (MgSO₄·7H₂O), is used in baths and as a mild laxative for health purposes.