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Date November 2017 Marks available 1 Reference code 17N.1.hl.TZ0.30
Level HL Paper 1 Time zone TZ0
Command term Question number 30 Adapted from N/A

Question

Consider the following half-equations:

I2 (s) + 2e \( \rightleftharpoons \) 2I (aq)                 Eθ = +0.54 V
(brown)          (colourless)

MnO4 (aq) + 8H+ (aq) + 5e \( \rightleftharpoons \) Mn2+ (aq) + 4H2O (l)                 Eθ = +1.51 V
(purple)                                      (colourless)                                                         

Which statement is correct for the reaction between KMnO4 (aq) and KI (aq) in acidic conditions?

A. MnO4 reduces I to I2.

B. I reduces MnO4 to Mn2+.

C. The colour changes from brown to purple.

D. MnO4 is oxidized to Mn2+.

Markscheme

B

Examiners report

[N/A]

Syllabus sections

Core » Topic 9: Redox processes » 9.1 Oxidation and reduction
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