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NEET levelSingle correct optionDifficulty 1 of 3ck001

The unit of the rate constant of a second order reaction, with concentration in $mol L^{- 1}$ and time in seconds, is

A $mol L^{- 1} s^{- 1}$
B $s^{- 1}$
C $L mo l^{- 1} s^{- 1}$
D $L^{2} mo l^{- 2} s^{- 1}$

Answer: C

For order

n

, rate

= k [A]^{n}

, so the unit of

k

is (unit of rate)/(unit of concentration)

^{n}

. For

n = 2

:

mol L^{- 1} s^{- 1} / mo l^{2} L^{- 2} = L mo l^{- 1} s^{- 1}

.

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