The rate constant of a reaction is $175 l i t^{2} m o l^{- 2} s e c^{- 1}$ . The order of the reaction is:

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Solution

The correct option is C 3
The expression for the rate of $n^{t h}$ order reaction is $r = k [A]^{n} .$

Substitute units of various quantities in the above expression.

Comparing both units:
$m o l . l i t^{- 1} s e c^{- 1} = (l i t^{2} m o l^{- 2} s e c^{- 1}) (m o l . l i t^{- 1})^{n}$
Thus, $n = 3$ .
Hence, the reaction is of 3rd order.

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