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Question

The unit of rate constant for a second order reaction is:


A
lit.sec
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B
lit.mole.sec
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C
mole1.lit.sec1
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D
mole.sec
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Solution

The correct option is C $$mole^{-1}.lit.sec^{-1}$$
Let the reaction be $$2\ A \rightarrow product$$

$$Rate\ of\ reaction = k[A]^{2}.$$
$$k= \dfrac{r}{[A]^{2}}$$
$$=\dfrac{mole}{lit.sec}\ \times \dfrac{(lit)^{2}}{mole^{2}}$$
$$\Rightarrow \dfrac{lit}{sec.mole}$$
$$\Rightarrow mole^{-1} lit.\ sec^{-1}$$

Option C is correct.

Chemistry

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