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KCET2026ChemistryChemical Kinetics

Which one of the following graph is not applicable for a 1st order reaction ( R P )?

Correct answer

0

Step-by-step solution

For a first-order reaction R P , the integrated rate law is given by: [R] = [R]₀ e^ -kt This indicates that the concentration of the reactant [R] decreases exponentially with time t . Therefore, the graph of [R] versus t should be an exponentially decaying curve. Graph (A) shows [R] as a constant horizontal line, which is incorrect for a first-order reaction. Taking the natural logarithm on both sides of the rate law: [R] = [R]₀ - kt This is a linear equation ( y = mx + c ) with a negative slope ( -k ). Graph (B) c

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