Q25 / 160 · TS EAMCET 2022 (20 Jul Shift 2) · Chemistry

For a reaction, the threshold energy is $75 \mathrm{~kJ} / \mathrm{mole}$. If the internal energy of the reactants is $20 \mathrm{~kJ} / \mathrm{mole}$, the activation energy (in $\mathrm{kJ} / \mathrm{mole}$ ) is

  • Correct answer
    A
    55
  • B
    20
  • C
    75
  • D
    95

Solution

Threshold energy = Activation energy + energy possessed by reacting species $$ 75=\mathrm{E}_{\mathrm{a}}+20 \text { or, } \mathrm{E}_{\mathrm{a}}=75-20=55 \mathrm{~kJ} / \mathrm{mol} $$

Hence, the correct answer is option: 'A'.

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