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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 2 · Set 3 · Q18
What is meant by the Rate law and Rate constant of a reaction. Identify the order of a reaction if the units of its Rate constant are: (a) s^-1 (b)…
What is meant by the Rate law and Rate constant of a reaction. Identify the order of a reaction if the units of its Rate constant are :
(a)
$\displaystyle \mathrm{s}^{-1}$
(b)
$\displaystyle \mathrm{mol}^{-1} \mathrm{~L} \mathrm{~s}^{-1}$
Marking-scheme solution
Rate law is the expression in which reaction rate is given in terms of molar concentration of
reactants raised to the power which is experimentally determined.
Rate constant is the rate of reaction when molar concentration of reactants is unity.
(a)
First order
(b)
Second order
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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.