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JEE Advanced2016ChemistryChemical KineticsActual

According to the Arrhenius equation,

Options

  1. AA high activation energy usually implies a fast reaction
  2. BRate constant increase with increase in temperature. This is due to a greater number of collisions whose energ
  3. CHigher the magnitude of activation energy, stronger is the temperature dependence of the rate constant
  4. DThe pre-exponential factor is a measure of the rate at which collisions occur, irrespective of their energy.

Correct answer

B. Rate constant increase with increase in temperature. This is due to a greater number of collisions whose energ

Step-by-step solution

A] k = A e - E a / R T High E a means less k, hence slower rate. B] e - E a / R T = fraction of molecules having kinetic energy greater than activation energy which increase as temperature increases. C] ln k 2 k 1 = E a R 1 T 1 - 1 T 2 i.e., ln K 2 k 1 ∝ E a D] Rate of reaction ∝ Total number of collisions × Fraction of collisions which can form product Rate of reaction ∝ Z A B × P × e - E a / R T ∝ A e - E a / R T

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