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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 2 · Set 2 · Q18
A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled…
A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled
(ii)
reduced to half ?
Marking-scheme solution
(i)
Rate = k[2R]$\displaystyle 2$
Rate=$\displaystyle 4$ times
(ii)
Rate = k[R/$\displaystyle 2$]$\displaystyle 2$
Rate = ¼ times
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.