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Chemistry

Laws of chemical combination

In this Class 11 Chemistry topic from “Some Basic Concepts of Chemistry,” students learn the fundamental laws that describe how elements combine to form compounds. They explore the law of conservation of mass, definite proportions, multiple proportions, and related ideas about combining volumes and particles. The topic helps students interpret chemical formulas, compare compound compositions, understand the basis of atomic theory, and apply these principles while balancing equations and solving introductory chemical calculations.

Easy · Level 15 · 25 questions

TOPIC PRACTICE

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  1. 12 grams
  2. 14 grams
  3. 16 grams
  4. 21 grams
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  1. 10 grams
  2. 12 grams
  3. 15 grams
  4. 18 grams
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  1. 8 grams
  2. 16 grams
  3. 24 grams
  4. 27 grams
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  1. 5 grams
  2. 10 grams
  3. 15 grams
  4. 20 grams
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  1. 2:3
  2. 3:2
  3. 4:3
  4. 8:3
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  1. Law of conservation of mass
  2. Law of definite proportions
  3. Law of multiple proportions
  4. Gay-Lussac’s law of gaseous volumes
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  1. 10 grams
  2. 15 grams
  3. 21 grams
  4. 30 grams
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  1. 1:2
  2. 2:1
  3. 3:4
  4. 4:3
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  1. 1:2
  2. 1:3
  3. 2:3
  4. 3:4
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  1. Definite proportions
  2. Multiple proportions
  3. Conservation of mass
  4. Gaseous volumes
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  1. 1:2
  2. 1:3
  3. 2:3
  4. 3:2
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  1. 1:2
  2. 2:1
  3. 1:5
  4. 5:2
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  1. Definite proportions
  2. Multiple proportions
  3. Gaseous volumes
  4. Conservation of mass
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  1. Law of definite proportions
  2. Law of conservation of mass
  3. Law of multiple proportions
  4. Law of gaseous volumes
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  1. 1:2
  2. 1:3
  3. 3:1
  4. 5:1
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  1. In a pure compound, the constituent elements are always present in a fixed ratio by mass.
  2. The total mass of reactants is always greater than the total mass of products.
  3. Elements can combine in a compound in any mass ratio.
  4. All gas volumes have the same mass at the same temperature and pressure.
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  1. 1:2:1
  2. 1:1:2
  3. 2:1:1
  4. 3:2:1
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  1. 2:1
  2. 1:2
  3. 4:1
  4. 1:4
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  1. 1:2
  2. 2:1
  3. 3:1
  4. 1:3
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  1. 2:3
  2. 3:2
  3. 4:1
  4. 1:4
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  1. 1:2
  2. 1:3
  3. 3:1
  4. 2:3
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  1. 20 percent
  2. 30 percent
  3. 70 percent
  4. 100 percent
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  1. 2:3
  2. 3:2
  3. 1:2
  4. 2:1
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  1. Yes, because 12:18 simplifies to 2:3
  2. No, because the amounts of substances in the two samples are different
  3. No, because the first term is smaller in the second ratio
  4. Yes, because the law of definite proportions applies to any two ratios
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  1. Both ratios are equivalent to 2:3
  2. The first ratio is 2:3, whereas the second is 3:2
  3. The elements are present in different ratios in the two samples
  4. The ratios prove that mass was destroyed

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