For Questions 18 - 20, refer to the reaction mechanism shown below: CIo (aq) +20

Question

For Questions 18 - 20, refer to the reaction mechanism shown below: CIo (aq) +200) K kHCI0(aq) +OH(aq) HCIO(aq) + OF(aq) FAST EQUILIBRIUM k2 Ir(aq) HCIO(aq)HIO(aq)+Cr(aq) FAST OHUaq) + H10(aq)-K3-H20(I) + IO-(aq) SLOW 18. Which of the following expresses the rate law for the given mechanism? A. rate kIOH[HIO] B. rate KIOH][I][HCIO] C. rate k[OH][I]HCIOICI] D. rate kI[HOj[CIO] rate = k[1][HClO][CIO][OH']2 1S 19. Which of the following represents an intermediate in the mechanism? For Qu CIO. B. OH C. Cl. D. H20 E. None of the above 20. Which of the following represents a catalyst in the mechanism? A. CIo HIO C. Cl D. H2O E. There is no catalyst in the mechanism.

Explanation / Answer

18.

Low step determines the rate of the reaction.

So,

OH-(aq)   +   HIO(aq)   ------>   H2O(l)   +   IO-(aq)

Rate = k [OH-] [HIO]

Answer is option (A)

19.

Intermediate is a species, which in formed in one step and consumed in subsequent step.

So, Answer is option (B) OH-.

20.

Answer is option (E).

There is no catalyst in the mechanism.

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