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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 5 · Set 1 · Q20
What happens to the rate constant k and activation energy E_a as the temperature of a chemical reaction is increased? Justify.
What happens to the rate constant k and activation energy $\displaystyle \mathrm{E}_{\mathrm{a}}$ as the temperature of a chemical reaction is increased ? Justify.
Marking-scheme solution
k increases.
Reason: k is proportional to the rate of the reaction / temperature of the reaction.
\(\displaystyle \mathrm{E}_{\mathrm{a}}\) unchanged / No effect.
Reason: \(\displaystyle \mathrm{E}_{\mathrm{a}}\) only depends on the nature of reactants / depends on the difference between the energy of activated complex and reactants.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.