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The plot of concentration of the reactant vs. time for a reaction is a straight line with a negative slope. The reaction follows a

1. zero order rate equation
2. first order rate equation
3. second order rate equation
4. third order rate equation

Correct answer: zero order rate equation

Solution

For a zero-order reaction, the concentration of the reactant decreases linearly with time, resulting in a straight-line plot with a negative slope.

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