Which of the following is never true for the rate law of an elementary reaction step?

The rate law for the individual step is always directly related to the number of colliding reactant particles.

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A catalyst applied to an individual step will always speed up the rate for the overall reaction.

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The elementary steps always add to give the total net overall reaction.

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The balanced chemical equation can not be used to determine the overall rate order for the reaction.

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Solution

The correct option is D A catalyst applied to an individual step will always speed up the rate for the overall reaction.
A catalyst applied to the slowest step only will speed up the rate of the overall reaction. But if a catalyst is applied to any individual step will not speed up the rate of the overall reaction.

Therefore, (B) is the correct answer

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