As the reaction proceeds, the rate of reaction:

decreases

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remains constant

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increases

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depends on the substance

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Solution

The correct option is A decreases
The rate of reaction or speed of reaction for a reactant or product is defined as how fast or slow a reaction takes place. The rate of reaction decreases as the reaction proceeds because the concentration of reactants is high at the start and with time, this concentration decreases and the reaction gets slower. So, the rate of reaction is dependent on concentration and hence, decreases with the passage of time.

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