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प्रश्न
A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is reduced to half?
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उत्तर
Rate of reaction, R = k [A]2
If the concentration of the reactant is reduced to half:
If [A] = `1/2` A,
rate = `k (A/2)^2`
= `1/4` kA2
Change in rate of reaction = `(1/4 kA^2) : kA^2`
= `1/4 : 1`
Therefore, the reaction rate decreases to one-fourth its original value.
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The rate of reaction is concerned with decrease in the concentration of reactants or increase in the concentration of products per unit of time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. A number of factors such as temperature, concentration of reactants, catalyst affect the rate of reaction. Mathematical representation of rate of a reaction is given by rate law: Rate = k[A]x [B]y x and y indicate how sensitive the rate is to change in concentration of A and B. Sum of x + y gives the overall order of a reaction. |
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