Chemical Kinetics · Class 12 Chemistry · Chapter 3
⏱️ Chemical Kinetics
CBSE Class 12 Science · Chemistry · Chapter 1
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📖Notes Deck
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Download PDF →📝Quick Drill
15 pattern-tagged MCQs with per-Q time budget. Drill under a 20-min timer.
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Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 90% | Pseudo-first-order numerical: given t and [A]/[A]0, find k or vice versa — Use t = (2.303/k)·log([A]₀/[A]); if asked t½, use 0.693/k. Always state units. | 3 MARKS |
| 70% | Arrhenius — find Ea from two rate constants at two temperatures — ln(k₂/k₁) = (Ea/R)(T₂−T₁)/(T₁T₂). Use R = 8.314. Convert final answer to kJ. | 3 MARKS |
| 75% | Order vs molecularity (2-3 differences + example) — Tabulate three differences; give one example each — close with 'order is experimental, molecularity is theoretical'. | 2 MARKS |
| 60% | Half-life derivation for zero / first order — Start from integrated rate law, substitute [A] = [A]₀/2, solve. State dependence on [A]₀. | 2 MARKS |
| 55% | Energy profile + effect of catalyst (graph) — Two curves on one axis (uncatalysed solid, catalysed dashed). Mark Ea, Ea(cat), ΔH. State catalyst does NOT change ΔH or K. | 2 MARKS |
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