The curve of concentration-time graph becomes horizontal when the rate of reaction
Correct answer: D. Becomes zero
- A. Increases
- B. Becomes constant
- C. Decreases
- D. Becomes zero
Explanation
The correct answer is Option D: Becomes zero. A horizontal line on a concentration-time graph indicates that there is no change in concentration over time, meaning the rate of reaction is zero. This is because the slope of the graph, which represents the rate, is zero.Option A is incorrect because an increasing rate would result in an upward sloping line. Option B is incorrect as a constant rate implies a constant slope, not a horizontal line. Option C is incorrect because a decreasing rate would result in a downward sloping line, not a horizontal one.
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About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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