Question

# Mr. Samwell Tarly has to learn Chemistry to become a Maester. He is stuck with Kinetics. Will you help him? (Maester is just Master in their language) Choose the appropriate definition of rate constant.

A
The constant which relates rate of reaction to the temperature.
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B
The rate of the reaction when concentration of reactants is equal to one.
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C
The concentration when rate of reaction is equal to 1 mol L1 sec1
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D
The constant which is added to the rate equation to make everything equal to one.
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Solution

## The correct option is B The rate of the reaction when concentration of reactants is equal to one.Let us take a sample equation like aA+bB → cC+dD According to the rate law, R ∝ [A]x[B]y Remember that x and y may not be equal to a and b. When we remove the proportionality, we add a proportionality constant. → R = k[A]x[B]y Here, if the [A] = 1 and [B] = 1, then R = k This is the definition of rate constant. It is the rate of the reaction when the concentration of all the reactants is equal to one.

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