Some electrode potentials are shown in Table 3.1.
Table 3.1
electrode reaction E/V
V2+ + 2e-v -1.20
V3+ + e 2+ -0.26
VO2+ + 2H+ + e¯ = V3+ + H₂O +0.34
VO2+ + 2H+ + e¯ ⇌ VO2+ + H₂O +1.00
Fe2+ + 2e-Fe -0.44
Fe3+ + 3e Fe -0.04
Fe3+ + eFe2+ +0.77
2H+ + 2e¯ H2 0.00
ClO® + H2O + 2e¯⇌ Cl¯ + 2OH- +0.89

Q: What topic does this question test?

This question tests Electrochemistry in A-Level Chemistry (syllabus code 9701). It is worth 18 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2023 examination, Paper 4 Variant 2 (9701_w23_qp_42.pdf).

Question

Some electrode potentials are shown in Table 3.1.
Table 3.1
electrode reaction                                   E/V
V2+ + 2e-v                                         -1.20
V3+ + e 2+                                          -0.26
VO2+ + 2H+ + e¯ = V3+ + H₂O                         +0.34
VO2+ + 2H+ + e¯ ⇌ VO2+ + H₂O                       +1.00
Fe2+ + 2e-Fe                                        -0.44
Fe3+ + 3e Fe                                        -0.04
Fe3+ + eFe2+                                        +0.77
2H+ + 2e¯ H2                                        0.00
ClO® + H2O + 2e¯⇌ Cl¯ + 2OH-                        +0.89

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