The reaction: X(g) → Y(g) follows first-order kinetics. The correct graph representing the rate of f — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

For a first-order reaction X → Y, [X] = X0 e^(-kt). The rate of formation of Y is d[Y]/dt = -d[X]/dt = k[X] = k X0 e^(-kt). The rate decays exponentially with time, corresponding to graph (d). Therefore, correct answer is D.