WASSCE Chemistry · Paper 1 style

Electrolysis

One sample question with the full working. 1 more in the app, with instant feedback and repair sessions for the traps below.

In electrolysis the negative electrode is the

Aanode
Belectrolyte
Ccathode
Dsalt bridge

Show the answer and working

Answer: C

Negative = cathode.

Trap A Swaps anode and cathode products: Cations go to the Cathode and gain electrons (reduction): metals or H₂. Anions go to the Anode and lose electrons (oxidation): O₂, Cl₂, or an active anode dissolves. 'An Ox, Red Cat.'

Trap B Takes one factor as the whole answer: Ask whether the option is necessary or sufficient. If the stem involves two changes or two conditions, both must appear in the answer.

Trap D Picks a related substance or process with a different role: Learn reagents and processes as one-line 'name → job' cards and contrast neighbours in a table (process | product | catalyst | conditions). Match the job in the stem, not just the topic.

Traps in Electrolysis

Swaps anode and cathode products
Cations go to the Cathode and gain electrons (reduction): metals or H₂. Anions go to the Anode and lose electrons (oxidation): O₂, Cl₂, or an active anode dissolves. 'An Ox, Red Cat.'
Takes one factor as the whole answer
Ask whether the option is necessary or sufficient. If the stem involves two changes or two conditions, both must appear in the answer.
Picks a related substance or process with a different role
Learn reagents and processes as one-line 'name → job' cards and contrast neighbours in a table (process | product | catalyst | conditions). Match the job in the stem, not just the topic.

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