Which one is not correct:a)Rate of zero order reaction depends upon initial concentration of reactantb)Rate of zero order reaction does not depend upon initial concentration of reactantc)t1/2 of first order reaction is independent of initial concentration of reactant.d)t1/2 of zero order reaction is dependent of initial concentration of reactant.Correct answer is option 'A'. Can you explain this answer?

Question

Answer

Explanation:

The correct answer is option 'A', which states that the rate of a zero-order reaction depends upon the initial concentration of the reactant. Let's understand why this statement is incorrect and why the rate of a zero-order reaction actually does not depend on the initial concentration of the reactant.

Zero-Order Reaction:
In a zero-order reaction, the rate of reaction is independent of the concentration of the reactant. This means that even if the initial concentration of the reactant is changed, the rate of reaction remains the same.

Rate of a Zero-Order Reaction:
The rate equation for a zero-order reaction is expressed as:
Rate = k

Here, 'k' represents the rate constant, which is a constant value for a given reaction at a particular temperature. It is independent of the initial concentration of the reactant.

Explanation of Incorrect Statement:
The statement in option 'A' suggests that the rate of a zero-order reaction depends on the initial concentration of the reactant. However, this contradicts the definition and behavior of a zero-order reaction. In a zero-order reaction, the rate is not affected by the initial concentration of the reactant. The rate remains constant throughout the reaction, regardless of the initial concentration.

Correct Statements:
Let's now go through the remaining options to understand their correctness:

b) Rate of zero-order reaction does not depend upon initial concentration of reactant:
This statement is correct. As explained earlier, the rate of a zero-order reaction is independent of the initial concentration of the reactant. The rate remains constant throughout the reaction.

c) t1/2 of first-order reaction is independent of initial concentration of reactant:
This statement is correct. The half-life (t1/2) of a first-order reaction is independent of the initial concentration of the reactant. The half-life is the time taken for the concentration of the reactant to reduce to half of its initial value.

d) t1/2 of zero-order reaction is dependent on initial concentration of reactant:
This statement is incorrect. The half-life of a zero-order reaction is actually independent of the initial concentration of the reactant. In a zero-order reaction, the concentration of the reactant decreases linearly with time. The half-life is the time taken for the concentration to decrease to half of its initial value. Since the rate of reaction is constant, the half-life remains constant throughout the reaction, regardless of the initial concentration.

Therefore, the correct answer is option 'A' because the rate of a zero-order reaction does not depend on the initial concentration of the reactant.

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