The decomposition of hydrogen peroxide in solution was studied in laboratory, an
ID: 518085 • Letter: T
Question
The decomposition of hydrogen peroxide in solution was studied in laboratory, and the following mechanism was proposed based on the experimental data.
Step 1. H2O2 + I- H2O + IO- (slow forward)
Step 2. H2O2 + IO- H2O + I- + O2 (fast equilibrium)
Which one of the following statements is false?
A
IO- is an intermediate species.
B
The reaction is first order with respect to I-.
C
I- is a catalyst.
D
The reaction is first order with respect to H2O2.
E
The reaction is first order with respect to IO-.
Explanation / Answer
Step 1. H2O2 + I- H2O + IO- (slow forward)
Step 2. H2O2 + IO- H2O + I- + O2 (fast equilibrium)
Which one of the following statements is false?
A) IO- is an intermediate species.
B) The reaction is first order with respect to I-.
C) I- is a catalyst.
D) The reaction is first order with respect to H2O2.
E) The reaction is first order with respect to IO-.
Answer = C) I- is a catalyst and E) The reaction is first order with respect to IO-.
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