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CBSE Class 11 Chemistry – Laws of Chemical Combination MCQs with Answers
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Introduction Paragraph
Understanding the Laws of Chemical Combination is a fundamental step in mastering Class 11 Chemistry, particularly under Part A: Physical Chemistry – Chapter 1: Some Basic Concepts of Chemistry. These laws — including the Law of Conservation of Mass, Law of Definite Proportions, Law of Multiple Proportions, Law of Reciprocal Proportions, and Gay-Lussac’s Law of Combining Volumes — form the cornerstone of chemical science.
This online MCQ practice test is designed strictly as per the NCERT syllabus, ensuring complete alignment with the CBSE Class 11 Chemistry curriculum. Each multiple-choice question has been carefully prepared to test your conceptual understanding, analytical ability, and application of these classical laws in chemical reactions.
With automatic scoring, per-question feedback, and a 30-minute timed quiz, students can evaluate their performance instantly. Whether you’re revising before exams or enhancing conceptual clarity, this CBSE Class 11 Chemistry MCQ quiz on Laws of Chemical Combination will help you strengthen your grasp on key chemical principles and achieve higher exam scores.
🧩 Sample MCQs on Laws of Chemical Combination (with Answers & Explanations)
Q1. Who is credited with formulating the Law of Conservation of Mass?
A) John Dalton
B) Joseph Proust
C) Antoine Lavoisier
D) Amedeo Avogadro
✅ Answer: C
Explanation: Antoine Lavoisier proposed the Law of Conservation of Mass, which states that mass can neither be created nor destroyed during a chemical reaction — it only changes form.
Q2. The Law of Definite Proportions states that:
A) Mass is always conserved in reactions
B) Elements combine in whole number ratios
C) A compound always contains the same elements in the same proportion by mass
D) Equal volumes of gases contain equal numbers of molecules
✅ Answer: C
Explanation: Proposed by Joseph Proust, this law asserts that a pure compound has a constant composition — the ratio of its elements by mass remains fixed, regardless of the sample source.
Q3. When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in simple whole number ratios. This is known as:
A) Law of Multiple Proportions
B) Law of Definite Proportions
C) Law of Conservation of Mass
D) Gay-Lussac’s Law
✅ Answer: A
Explanation: John Dalton proposed the Law of Multiple Proportions, which explains how elements can combine in multiple ways to form different compounds (e.g., CO and CO₂).
Q4. The Law of Reciprocal Proportions was given by:
A) Jeremias Richter
B) John Dalton
C) Antoine Lavoisier
D) Joseph Proust
✅ Answer: A
Explanation: Jeremias Richter introduced this law, which states that if two elements separately combine with a third, their combining masses also bear a simple whole number ratio with each other.
Q5. According to Gay-Lussac’s Law of Combining Volumes, the volume ratio of hydrogen and oxygen forming water vapor is:
A) 1:1
B) 2:1
C) 1:2
D) 2:2
✅ Answer: B
Explanation: Gay-Lussac observed that 2 volumes of hydrogen gas combine with 1 volume of oxygen gas to produce 2 volumes of water vapor, illustrating a simple whole-number ratio of gas volumes.
✅ Highlight:
These MCQs on Laws of Chemical Combination (Class 11 Chemistry) are strictly based on NCERT and are perfect for CBSE board exam practice and quick conceptual revision. Each question follows the CBSE pattern and reinforces fundamental principles of physical chemistry.