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Question: The rates of a certain reaction (dc/dt) at different times are as follows. Time Rate (mole litre<su...

The rates of a certain reaction (dc/dt) at different times are as follows.

Time Rate (mole litre–1 sec –1 )

0 2.8×10−22.8 \times 10^{- 2}

10 2.78×10−22.78 \times 10^{- 2}

20 2.81×10−22.81 \times 10^{- 2}

30 2.79×10−22.79 \times 10^{- 2}

The reaction is.

A

Zero order

B

First order

C

Second order

D

Third order

Answer

Zero order

Explanation

Solution

The concentration of reactant does not change with time for zero order reaction (unit of K suggests zero order) since reactant is in excess.