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CBSE Class 11 Chemistry – Sodium, Potassium, Calcium & Magnesium MCQs with Answers
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CBSE Class 11 Chemistry Quiz – Sodium, Potassium, Calcium & Magnesium Compounds
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NCERT-Based Class 11 MCQs: s-Block Elements and Their Important Compounds
Introduction
Master CBSE Class 11 Chemistry Chapter 10 – The s-Block Elements with this focused MCQ Practice Test on Sodium, Potassium, Calcium, and Magnesium Compounds. These multiple-choice questions are created strictly as per the NCERT Class 11 Chemistry syllabus, ensuring complete alignment with CBSE board exam standards.
This topic covers some of the most important compounds of alkali and alkaline earth metals, such as NaOH, Na₂CO₃, KNO₃, CaO, Ca(OH)₂, Mg(OH)₂, and MgSO₄. The quiz tests conceptual understanding of their physical and chemical properties, reactions, industrial applications, and everyday significance.
Each question in this online Chemistry MCQ test includes detailed explanations to strengthen conceptual clarity and enhance exam preparation. Ideal for self-assessment, homework practice, and board exam revision, this quiz helps students boost confidence and accuracy.
Whether you’re preparing for CBSE Class 11 final exams or entrance-level assessments like JEE or NEET, these questions on s-Block element compounds will help you build a solid conceptual foundation in inorganic chemistry.
Sample MCQs (with Answers and Explanations):
Q1. Which compound is commonly known as washing soda?
A) NaHCO₃
B) Na₂CO₃·10H₂O
C) Na₂SO₄
D) NaCl
Answer: B) Na₂CO₃·10H₂O
Explanation: Washing soda is sodium carbonate decahydrate. It is used for cleaning, water softening, and glass manufacturing.
Q2. Which compound is called milk of magnesia and used as an antacid?
A) MgCl₂
B) Mg(OH)₂
C) MgCO₃
D) MgSO₄·7H₂O
Answer: B) Mg(OH)₂
Explanation: Milk of magnesia is a suspension of magnesium hydroxide, a mild base that neutralizes stomach acid.
Q3. Which salt forms a milky precipitate when carbon dioxide is passed through lime water?
A) CaSO₄
B) CaCO₃
C) CaO
D) Ca(OH)₂
Answer: B) CaCO₃
Explanation: CO₂ reacts with Ca(OH)₂ to form insoluble calcium carbonate, turning lime water milky.
Q4. Potassium nitrate (KNO₃) is commonly used in:
A) Soap manufacturing
B) Gunpowder and fertilizers
C) Water purification
D) Vinegar production
Answer: B) Gunpowder and fertilizers
Explanation: KNO₃ is an oxidizing agent used in gunpowder and as a nitrogen source in fertilizers.
Q5. Which compound is obtained when calcium carbonate is heated strongly?
A) Ca(OH)₂
B) CaO and CO₂
C) CaCl₂
D) CaSO₄
Answer: B) CaO and CO₂
Explanation: Thermal decomposition of calcium carbonate produces quicklime (CaO) and carbon dioxide — a key industrial process in lime manufacturing.