# The rate of a reaction is expressed in the units

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The rate of a reaction is expressed in the units
A. L "mol"^(-1)t^(-1)
B. mol dm^(-3)t_(-1)
C. Ms
D. M^(-1)s^(-1)

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Correct option is: (B) $mol \ dm^{-3} \ t^{-1}$

Rate of reaction (r) = $\frac {Change\, in\, concentration}{time}$

Therefore,

Initial rate of reaction = $\frac {M}{S}$

or $\frac {mol}{\frac {dm^3}{s}} = mol\, dm^{-3}s^{-1}$

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