Question 59

The number of incorrect statement/s from the following is _______
A. The successive half lives of zero order reactions decreases with time.
B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction
C. Order and molecularity of a chemical reaction can be a fractional number
D. The rate constant units of zero and second order reaction are mol L$$^{-1}$$ s$$^{-1}$$ and mol$$^{-1}$$ L s$$^{-1}$$ respectively

Correct Answer: 1

A: Successive half-lives of zero order decrease. $$t_{1/2} = \frac{[A]_0}{2k}$$, which decreases as [A] decreases. Correct.

B: A reactant in the equation may not affect rate (if zero order w.r.t. it). Correct.

C: Order can be fractional, but molecularity is always a whole number. Incorrect.

D: Zero order: mol L⁻¹ s⁻¹ ✓. Second order: mol⁻¹ L s⁻¹ ✓. Correct.

Number of incorrect statements = 1 (only C).

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