JEE Main 2023 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 15 April 2023, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

For a reversible reaction

\mathrm{A \rightleftharpoons B}

, the

\Delta H_{\text{forward reaction}} = 20

\mathrm{mol^{-1}}

. The activation energy of the uncatalysed forward reaction is 300 kJ

\mathrm{mol^{-1}}

. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at

27^\circ\mathrm{C}

is found to be same as that of the uncatalysed reaction at

327^\circ\mathrm{C}

. The activation energy of the catalysed backward reaction is __________ kJ

\mathrm{mol^{-1}}

Official answer

130

NTA final key.

Same idea in other shifts