For a reaction,given below is the graph of $\ln k$ vs $\frac{1}{T}$. The activation energy for the reaction is equal to $...... \ cal \ mol^{-1}$. (Nearest integer). (Given : $R = 2 \ cal \ K^{-1} \ mol^{-1}$)

  • A
    $8$
  • B
    $40$
  • C
    $4$
  • D
    $20$

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Which one of the following given graphs represents the variation of rate constant $(k)$ with temperature $(T)$ for an endothermic reaction?

The minimum energy that reactant molecules must possess at the time of collision for an effective collision is called ...

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