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Important Questions

Chemical Kinetics

ICSE · Class 12 · Chemistry

Most important questions from Chemical Kinetics for ICSE Class 12 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.

99 questions40 flashcards5 concepts

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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:

Show answer

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:

Show answer

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:

Show answer

10 s

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

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Frequently Asked Questions

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.
How many important questions are there in Chemical Kinetics?
There are 99 practice questions available for Chemical Kinetics. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

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

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