Chemical Kinetics — Important Questions
ICSE · Class 12 · Chemistry
99 important questions from Chemical Kinetics for ICSE Class 12 Chemistry, with answers. Includes multiple choice and true false questions.
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Important Questions from Chemical Kinetics
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
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.
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.
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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