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JEE Main levelOne or more correct optionsDifficulty 2 of 3ck021

For the concentration unit $mol L^{- 1}$ and time in seconds, which of the following pairs of reaction order and unit of $k$ are correct?

Azero order: $mol L^{- 1} s^{- 1}$
Bfirst order: $s^{- 1}$
Csecond order: $mol L^{- 1} s^{- 1}$
Dthird order: $L^{2} mo l^{- 2} s^{- 1}$

Answer: A, B, D

The unit of

k

is

(mol L^{- 1})^{1 - n} s^{- 1}

for order

n

. For

n = 0

it is

mol L^{- 1} s^{- 1}

, for

n = 1

it is

s^{- 1}

, and for

n = 3

it is

L^{2} mo l^{- 2} s^{- 1}

. For

n = 2

it is

L mo l^{- 1} s^{- 1}

, so the second-order pair is wrong.

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