100 g of a substance decays slower than 50 g of the same substance. The order of decay follows kinetics:
Correct answer: A. Zero order
- A. Zero order
- B. 1st order
- C. 2nd order
- D. 3rd order
Explanation
Option A, "Zero order," is correct because in a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. This means that the rate of decay remains constant over time, regardless of how much of the substance is present. In this scenario, if 100 g of the substance decays slower than 50 g, it suggests that the rate of decay is not dependent on the concentration of the substance. This is a characteristic of a zero-order reaction.
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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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