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Chemical Kinetics

ICSE · Class 12 · Chemistry

Practice quiz for Chemical Kinetics — ICSE Class 12 Chemistry. MCQs and questions with answers to test your preparation.

99 questions40 flashcards5 concepts

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An infographic illustrating the key factors that influence the rate of a chemical reaction, such as concentration, temperature, surface area, catalyst, and nature of reactants.
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Quick Quiz: Chemical Kinetics

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1

The branch of chemistry that deals with the study of reaction rates is called:

2

The units of rate of reaction are:

3

The units of rate constant for a first-order reaction are:

4

Which of the following reactions is likely to be the fastest?

99 Questions·
multiple choicetrue false

Sample Questions

1multiple choice

For the reaction N₂ + 3H₂ → 2NH₃, if rate of disappearance of N₂ is 2 × 10⁻⁴ mol L⁻¹ s⁻¹, the rate of disappearance of H₂ is:

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6 × 10⁻⁴ mol L⁻¹ s⁻¹

Rate = -d[N₂]/dt = -(1/3)d[H₂]/dt. So d[H₂]/dt = 3 × d[N₂]/dt = 3 × 2 × 10⁻⁴ = 6 × 10⁻⁴ mol L⁻¹ s⁻¹

2true false

The rate constant k of a reaction increases with increasing concentration of reactants.

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False

Rate constant k is independent of concentration. k only changes with temperature.

3multiple choice

For the reaction A + 2B → 3C + 2D with Rate = k[A][B]², the overall order of reaction is:

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3

Overall order = sum of powers in rate law = 1 + 2 = 3 (third order). Not related to stoichiometric coefficients.

4multiple choice

The half-life of a first-order reaction with rate constant k = 6.93 × 10⁻² s⁻¹ is:

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10 s

t½ = 0.693/k = 0.693 / (6.93 × 10⁻²) = 0.693/0.0693 = 10 s

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What are the important topics in Chemical Kinetics for ICSE Class 12 Chemistry?
Key topics in Chemical Kinetics include Determining Reaction Order from Rate Constant Units, Flowchart showing the decision process for calculating reaction rates with different stoichiometric coefficients, Comparison of average and instantaneous rate calculations and their characteristics. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Kinetics — ICSE Class 12 Chemistry?
Understand the core concepts first, then work through the 99 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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