Surface Chemistry & Solid State · JEE Main previous year questions

2025 1 question

1. Q512025 · 4 Apr 2025 · Shift 1

   For ${\mathrm{A}}_2+{\mathrm{B}}_2\rightleftharpoons 2AB$ ${\mathrm{E}}_{\mathrm{a}}$ for forward and backward reaction are 180 and $200\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively If catalyst lowers ${\mathrm{E}}_{\mathrm{a}}$ for both reactions by $100\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. Which of the following statement is correct?

   1. A.Catalyst does not alter the Gibbs energy change of a reaction.
   2. B.The enthalpy change for the reaction is $+20\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$.
   3. C.Catalyst can cause non-spontaneous reactions to occur.
   4. D.The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction.
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   Answer: A