Data should be selected from [Table 3.1] in order to answer some parts of this question.
[Table 3.1]
electrode reaction E° / V
Cl2 + 2e- ⇌ 2Cl- +1.36
2HOCl + 2H+ + 2e- ⇌ Cl2 + 2H2O +1.64
ClO- + H2O + 2e- ⇌ Cl- + 2OH- +0.89
Sn4+ + 2e- ⇌ Sn2+ +0.15
Sn2+ + 2e- ⇌ Sn -0.14
V2+ + 2e- ⇌ V -1.20
V3+ + e- ⇌ V2+ -0.26
VO2+ + 2H+ + e- ⇌ V3+ + H2O +0.34
VO2+ + 2H+ + e- ⇌ VO2+ + H2O +1.00

Q: What topic does this question test?

This question tests Electrochemistry in A-Level Chemistry (syllabus code 9701). It is worth 10 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2022 examination, Paper 4 Variant 1 (9701_w22_qp_41.pdf).

Question

Data should be selected from [Table 3.1] in order to answer some parts of this question.
[Table 3.1]
electrode reaction									E° / V
Cl2 + 2e- ⇌ 2Cl-									+1.36
2HOCl + 2H+ + 2e- ⇌ Cl2 + 2H2O						+1.64
ClO- + H2O + 2e- ⇌ Cl- + 2OH-						+0.89
Sn4+ + 2e- ⇌ Sn2+									+0.15
Sn2+ + 2e- ⇌ Sn										-0.14
V2+ + 2e- ⇌ V											-1.20
V3+ + e- ⇌ V2+										-0.26
VO2+ + 2H+ + e- ⇌ V3+ + H2O						+0.34
VO2+ + 2H+ + e- ⇌ VO2+ + H2O						+1.00

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