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  • Which of these changes with time for a first order reaction? (A)Rate of reaction (B)Rate constant (C)Half-lifeOption: 1 <p

Which of these changes with time for a first order reaction?

(A)Rate of reaction

(B)Rate constant

(C)Half-life

Option: 1

A only


Option: 2

C only


Option: 3

A & B only


Option: 4

B & C only


Answers (1)

best_answer

First-order Reaction formula -

k=\frac{2.303}{t} \log _{10} \frac{[A]_{0}}{[A]_{t}}

The half-Life formula of first-order reaction :

t_\frac{1}{2}=\frac{0.693}{k}

Rate constant depends on temperature and the half-life is independent of concentration.

So, only the rate of reaction changes with time for the first order.
Therefore, option(1) is correct

Posted by

Devendra Khairwa

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