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NEST2011ChemistryChemical Kinetics

Kinetic energy (E_k ) of a molecule is related to its velocity (v) by the expression, E_k= 1 2 m v^2 . E_k follows Boltzmann distribution as schematically given below. During a chemical reaction, only the reactant molecules that possess a minimum energy (E_a ) , called activation energy, give the products. For the reaction, 2 ~N ₂ O ₅ 4 NO ₂+ O ₂ , the rate constant dependence on temperature is given by k=A e^ -E_ a

Options

  1. AE_a may be altered in the presence of a catalyst.
  2. BE_a decreases with increase in temperature.
  3. CFraction of molecules with energy higher than the activation energy increases with temperature.
  4. DRate constant increases with increase in temperature.

Correct answer

B. E_a decreases with increase in temperature.

Step-by-step solution

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