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JEE Main Chemistry question

ChemistryChemical KineticsJEE Main

Following are two first order reactions with their half times given at 25°C: Products; Products. The temperature coefficients of their reaction rates are 3 and 2, respectively, between 25°C and 35°C. If the above two reactions are carried out taking 0.4 M of each reactant but at different temperatures: 25°C for the first reaction (A) and 35°C for the second reaction (B), find the ratio of the concentration of A and B after an hour.

Answer: 2

Solution

Reaction is run at its own reference temperature (25°C), so its half-life stays at 30 min; in 60 min that is 2 half-lives, giving . Reaction is run at 35°C, 10° above its reference

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Question ID VK-144471