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NEET levelSingle correct optionDifficulty 1 of 3ck121

The rate of most reactions increases markedly with temperature mainly because

Athe collision frequency doubles for every 10 K rise
Bthe molecules become heavier
Ca much larger fraction of molecules possesses energy at least equal to $E_{a}$
Dthe activation energy decreases with temperature

Answer: C

A small rise in temperature increases the fraction

e^{- E_{a} / RT}

by a large factor (often 2 to 3 per 10 K). The rise in collision frequency is only a fraction of a percent, and

E_{a}

is nearly constant.

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