Which of the following statements is correct?

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(A) $1$. The temperature coefficient of a reaction is defined as the ratio of rate constants at two temperatures differing by $10 \ ^oC$. For most rea

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$10 \ ^oC$ rise in temperature leads to an increase in the rate of reaction by $2$ to $3$ times.

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(A) $1$. The temperature coefficient of a reaction is defined as the ratio of rate constants at two temperatures differing by $10 \ ^oC$. For most reactions,this value lies between $2$ and $3$. Thus,a $10 \ ^oC$ rise in temperature approximately doubles or triples the rate of reaction.$2$. $A$ catalyst provides an alternative pathway with lower activation energy,but it does not change the initial and final energy states of the reactants and products,so $\Delta H$ remains unchanged.$3$. Elementary reactions are single-step processes. $A$ zero-order reaction requires a complex mechanism involving multiple steps or surface catalysis,so it cannot be elementary.$4$. The half-life of a reaction depends on the order of the reaction and the initial concentration of reactants (except for first-order reactions),so it is not constant for every reaction.

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