Which of the following is NOT an example of electrolysis?

JAMB Chemistry 2023 65 views

Which of the following is NOT an example of electrolysis?

  1. Electroplating of silver onto a copper surface.
  2. Decomposition of water into hydrogen and oxygen gas.
  3. Dissolution of sugar in water to form a sugar solution. ✓
  4. Extraction of aluminum from bauxite ore.

Explanation

Electrolysis requires passing electric current through a liquid to cause chemical changes. Sugar dissolving in water is a physical change that happens naturally without electricity.

When sugar dissolves, the sugar molecules spread out in water but remain chemically unchanged. No electric current is needed for this simple mixing process.

Electroplating, water decomposition, and aluminum extraction all use electricity to force chemical reactions. Only sugar dissolution occurs without electrical energy input.

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