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ChemistryJEE Main 8 Apr 2026, Shift 2·Q7·MCQ·Moderate

Chemical Kinetics · Arrhenius equation and half-life

Given below are two statements :

R=8.314R = 8.314 J K−1^{-1} mol−1^{-1} and 1 cal =4.2= 4.2 J

Statement I : When Ea =12.6= 12.6 kcal/mol, the room temperature rate constant is doubled by a 10∘^\circC increase in temperature (298 K to 308 K)

Statement II : For a first order reaction A→B\ce{A -> B},

Here [A]0[\mathrm{A}]_0 is the initial concentration of A and t1/2t_{1/2} is half-life of reaction.

In the light of the above statements, choose the correct answer from the option given below :

  1. (1)Both Statement I and Statement II are true
  2. (2)Both Statement I and Statement II are false
  3. (3)Statement I is true but Statement II are false
  4. (4)Statement I is false but Statement II are true

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See the full 8 Apr 2026, Shift 2 paper