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Date November 2011 Marks available 1 Reference code 11N.1.sl.TZ0.8
Level SL Paper 1 Time zone TZ0
Command term Determine Question number 8 Adapted from N/A

Question

Which of the following redox reactions take place?

I.     \({\text{C}}{{\text{l}}_2}{\text{(aq)}} + {\text{2NaI(aq)}} \to {{\text{I}}_2}{\text{(aq)}} + {\text{2NaCl(aq)}}\)

II.     \({\text{B}}{{\text{r}}_2}{\text{(aq)}} + {\text{2NaI(aq)}} \to {{\text{I}}_2}{\text{(aq)}} + {\text{2NaBr(aq)}}\)

III.     \({{\text{I}}_2}{\text{(aq)}} + {\text{2NaBr(aq)}} \to {\text{B}}{{\text{r}}_2}{\text{(aq)}} + {\text{2NaI(aq)}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

Markscheme

A

Examiners report

One respondent stated that the wording of the question could have been better if it was stated which of the redox reactions are likely to occur, which is a fair point. The question was one of the more difficult questions on the paper, though 54% did manage to get the correct answer, namely A.

Syllabus sections

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