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Assertion : In rate law, unlike in the e...

Assertion : In rate law, unlike in the expression for equilibrium constants, the exponents for concentration do not necessarily match the stoichiometric coefficients.
Reason : It is the mechanism and not the balanced chemical equation for the overall change that governs the reaction rate.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that in rate law, the exponents for concentration do not necessarily match the stoichiometric coefficients, unlike in the expression for equilibrium constants. **Hint:** Recall the definitions of rate laws and equilibrium constants. ### Step 2: Understand the Reason The reason given is that the mechanism of the reaction, rather than the balanced chemical equation, governs the reaction rate. This means that the rate law is derived from the reaction mechanism, which may involve intermediate steps that are not reflected in the overall balanced equation. **Hint:** Think about how the rate law is determined and the role of the rate-determining step. ### Step 3: Analyze the Relationship The assertion is true because the rate law is based on the elementary steps of the reaction mechanism, which may not correspond to the stoichiometric coefficients in the balanced equation. The reason is also true because it correctly explains why the assertion holds; the mechanism dictates the rate law. **Hint:** Consider how the rate-determining step influences the rate law. ### Step 4: Conclusion Since both the assertion and reason are true, and the reason correctly explains the assertion, we conclude that the correct answer is that both the assertion and reason are true, and the reason is a correct explanation of the assertion. **Final Answer:** Both assertion and reason are true, and the reason is a correct explanation of the assertion.
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