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CBSE Class 11 Chemistry – Solubility, Flame Tests & Applications MCQs with Answers
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Class 11 Chemistry MCQs: s-Block Elements and Their Real-Life Applications
Introduction
Strengthen your CBSE Class 11 Chemistry preparation with this exclusive set of MCQs on Solubility, Flame Tests, and Applications of s-Block Elements, designed strictly as per the NCERT syllabus. This quiz focuses on the physical and chemical behaviors of alkali and alkaline earth metals, including their solubility trends, flame coloration tests, and industrial uses.
The s-Block Elements — particularly compounds of sodium, potassium, calcium, and magnesium — show characteristic flame colors due to electron excitation, which is an important concept for board exams. This topic also explores their applications in glass making, medicine, fertilizers, and water softening processes.
Each question in this online practice test comes with instant feedback and detailed explanations to enhance conceptual clarity. Ideal for self-assessment and CBSE exam revision, this quiz helps students build confidence while mastering core concepts of Inorganic Chemistry.
Attempt the 30-minute timed quiz to test your understanding of solubility rules, flame test observations, and the real-world significance of s-Block elements.
Sample MCQs (with Answers and Explanations):
Q1. Which metal salt imparts a bright yellow color in the flame test?
A) Lithium
B) Sodium
C) Potassium
D) Calcium
Answer: B) Sodium
Explanation: Sodium salts produce an intense golden-yellow flame due to electronic transitions in sodium atoms.
Q2. Which calcium compound gives a brick-red flame color when heated?
A) CaCO₃
B) CaCl₂
C) CaO
D) Ca(OH)₂
Answer: B) CaCl₂
Explanation: Calcium compounds impart a brick-red flame color; this is used to identify calcium ions in qualitative analysis.
Q3. The solubility of Group 2 hydroxides in water:
A) Decreases down the group
B) Increases down the group
C) Remains constant
D) First increases then decreases
Answer: B) Increases down the group
Explanation: Solubility of Group 2 hydroxides increases from Mg(OH)₂ to Ba(OH)₂ due to decreasing lattice energy.
Q4. Which compound is used in glass manufacture to reduce the melting point of silica?
A) NaHCO₃
B) Na₂CO₃
C) NaOH
D) NaCl
Answer: B) Na₂CO₃
Explanation: Sodium carbonate lowers silica’s melting point and is a key ingredient in soda-lime glass production.
Q5. Which magnesium compound is used as an antacid in medicine?
A) MgCO₃
B) MgSO₄
C) Mg(OH)₂
D) MgCl₂
Answer: C) Mg(OH)₂
Explanation: Magnesium hydroxide, known as milk of magnesia, neutralizes stomach acid and relieves indigestion.