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KCET2024ChemistryChemical Kinetics

For the reaction, A B, E_a=50 ~kJ ~mol ⁻¹ and H=-20 ~kJ ~mol ⁻¹ . When a catalyst is added E_a decreases by 10 ~kJ ~mol ⁻¹ . What is the E_a for the backward reaction in the presence of catalyst?

Options

  1. A60 ~kJ ~mol ⁻¹
  2. B40 ~kJ ~mol ⁻¹
  3. C70 ~kJ ~mol ⁻¹
  4. D20 ~kJ ~mol ⁻¹

Correct answer

A. 60 ~kJ ~mol ⁻¹

Step-by-step solution

Given, A B (E_a )_f=50 ~kJ / mol H=-20 ~kJ / mol (E_a )_b=? using the formula H= (E_a )_f- (E_a )_b-20=40- (E_a )_h (E_a )_b=40+20=60 ~kJ / mol

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