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The rate of a reaction at a particular instant of time is called:

Option: 1

Instantaneous rate


Option: 2

Average rate


Option: 3

Non-spontaneous rate


Option: 4

Spontaneous rate


Answers (1)

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Instantaneous rate of a reaction:
Rate of reaction at a particular instant is called Instantaneous rate of a reaction. For a reaction
 A \longrightarrow B
\mathrm{ R_{\text {instantaneous }}=\lim _{\Delta t \rightarrow 0}\left(\frac{\Delta C}{\Delta t}\right)=\frac{d C}{d t} \\ }
In terms of reactant A :
\mathrm{ R_{\text {instantaneous }}=-\frac{d[A]}{d t} }
Negative sign indicates decrease in the reactant's concentration.
In terms of product B :
\mathrm{ R_{\text {instantaneous }}=\frac{d[B]}{d t} }

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