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Rate of reaction increases with decrease in concentration of reactants.

Rate law or rate equation show's rate of reaction in terms of concentration

Units its of rate constant are mol L-1s-1

For the reaction,aA+bB⟶ product, if rate =[A]x and [B]ya and b arc always equal to x and y.

answer is B.

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Detailed Solution

Rate of reaction ∝ concentration of reactant so rate of reaction decreases with decrease in concentration of reactants. Units of rate constant depend upon the order of reaction. Rate law expression shows the rate of reaction is terms of concentration. i.e. r=[A]x[B]yHere, x and y may or may not be equal to stoichiometric coefficients.

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