If the concentration of the reactants is decreased, the rate of reaction:

will increase

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will remain unaffected

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will decrease

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cannot be determined

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Solution

The correct option is D cannot be determined
If the concentration of the reactants is decreased, the rate of reaction cannot be determined.
If the rate of the reaction is directly proportional to the nth power of reactant concentration, then if the concentration of the reactants is decreased, the rate of reaction will decrease.
If the rate of the reaction is inversely proportional to the nth power of reactant concentration, then if the concentration of the reactants is decreased, the rate of reaction will increase.

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