For the reaction 3A → B + C, under which condition will it behave as a zero-order reaction?

The reaction rate is proportional to the square of the concentration of A
The reaction rate stays constant at all concentrations
The rate does not change with any concentration of B and C
The reaction rate becomes double when the concentration of B is doubled

Correct answer: The reaction rate stays constant at all concentrations

Solution

A zero-order reaction has a rate that does not depend on reactant concentration, i.e. the rate stays constant at all concentrations of A.

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