Consider the following mebrane cell. Concentrated brine is pumped into the anode compartment.
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An electrochemical cell is used to electroplate an iron spoon with nickel. Which ONE of the following half reactions takes place at the positive electrode of this cell?
Fe2+ (aq) + 2e- --> Fe(s)
Fe(s) --> Fe2+ (aq) + 2e-
Ni2+(aq) + 2e- ---> Ni(s)
Ni(s) ---> Ni2+(aq) + 2e-
Which of the following reactions is non-spontaneous?
A
B
C
D
Cr2O72- + SO32- → Cr3+ + SO42-
Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.
Cr3+ ions
O2
Cr+6 ions
S6+ ions
O2- ions
S4+ ions
Cr2
Substance being oxidised
Substance being reduced
Spectator ion
Oxidising agent
Reducing agent
Which ion is transported across the membrane to the cathode compartment?
Hydrogen ions
Chloride ions
Sodium ions
Oxygen ions
Name product B produced at the cathode.
Hydrogen
Carbon Dioxide
Oxygen
Chlorine
Water is a better reducing agent than chloride ions
