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Question

# Consider the reaction, A → B. Rate of reaction = + d[B]dt . Which of the following statement(s) defines the positive sign used in the rate of the given reaction?

A

The concentration of B remains constant with time.

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B

Increase in the concentration of B with time.

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C

Decrease in the concentration of B with time.

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D

The concentration of B is zero.

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Solution

## The correct option is B Increase in the concentration of B with time. The rate of chemical reaction is defined as the change in the concentration of any one of the reactants or products per unit time. Consider the reaction A → B , Rate of the reaction is given by, Rate = −d[A]dt=+d[B]dt. Where, [A] → concentration of reactant A [B] → concentration of product B (-) Negative sign indicates a decrease in concentration of A with time. (+) Positive sign indicates an increase in concentration of B with time.

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