Relevant Titles:
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CBSE Class 11 Chemistry MCQs – Limiting Reagent and Percent Purity Practice Test
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Class 11 Chemistry Chapter 1 MCQs – NCERT-Based Quiz on Limiting Reagent
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Limiting Reagent and Percent Purity MCQs for CBSE Class 11 – Free Online Test
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CBSE Class 11 Physical Chemistry Quiz – Limiting Reagent and Percent Purity Concepts
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NCERT Class 11 Chemistry Online MCQs – Stoichiometry and Percent Purity Practice
📚 Introduction Paragraph
Limiting Reagent and Percent Purity are key concepts from Chapter 1 – Some Basic Concepts of Chemistry in CBSE Class 11 Physical Chemistry. These topics are essential for mastering stoichiometric calculations and understanding how reactant quantities influence product yield in chemical reactions. In this online MCQ practice test, students can test their grasp of identifying the limiting reagent, calculating theoretical yield, and determining percent purity of compounds.
Designed strictly according to the NCERT Class 11 Chemistry syllabus, this quiz is ideal for CBSE board exam preparation as well as for entrance exams like JEE Main and NEET. The questions are conceptual and calculation-based, ensuring balanced coverage of both theory and numerical problem-solving.
By attempting these Limiting Reagent and Percent Purity MCQs, learners can reinforce their analytical skills, understand practical chemical relationships, and improve accuracy in quantitative Chemistry.
🧩 Sample MCQs (with Answers & Explanations):
Q1. In the reaction 2H₂ + O₂ → 2H₂O, if 4 moles of H₂ react with 1 mole of O₂, the limiting reagent is:
A. H₂ B. O₂ C. H₂O D. None
✅ Answer: B. O₂
💡 Explanation: For 4 mol H₂, 2 mol O₂ are needed. Since only 1 mol O₂ is available, O₂ is the limiting reagent.
Q2. Which of the following defines “percent purity”?
A. Ratio of impure sample to pure compound × 100
B. Ratio of pure compound to impure sample × 100
C. Ratio of theoretical yield to actual yield × 100
D. Ratio of total product to total reactant × 100
✅ Answer: B
💡 Explanation: Percent purity = (mass of pure substance / mass of impure sample) × 100.
Q3. If a 10 g sample of Na₂CO₃ contains 8.5 g of pure Na₂CO₃, its percent purity is:
A. 75% B. 85% C. 90% D. 95%
✅ Answer: B
💡 Explanation: Percent purity = (8.5 / 10) × 100 = 85%.
Q4. A + 2B → C. If 1 mol A and 1 mol B are used, the limiting reagent is:
A. A B. B C. C D. None
✅ Answer: B
💡 Explanation: 1 mol A requires 2 mol B. Since only 1 mol B is present, B is the limiting reagent.
Q5. A 15 g impure sample of CaCO₃ yields 12 g pure CaCO₃. The percent purity is:
A. 60% B. 70% C. 80% D. 90%
✅ Answer: C
💡 Explanation: (12 / 15) × 100 = 80%. The sample is 80% pure CaCO₃.