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Q.

Which does not change with time for a first-order reaction?

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a

The amount of reactant that disappears in each half- life

b

The length of each half-life

c

The rate of the reaction

d

The concentration of the reactant

answer is C.

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Detailed Solution

 For a first-order reaction the length of each half-life does not changes with the time. The half life for first order is constant.

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