CH-1771
Electrolysis of solutions
Chemistry · Secondary 4 · Hard · Electrolysis of solutions
A student sets up a circuit with a lamp and two graphite electrodes dipped into a beaker of solid potassium iodide. The lamp does not light. Distilled water is then added and the solid dissolves; the lamp lights up.
Which statement explains these observations?
Which statement explains these observations?
- Electrons move freely in solid potassium iodide.
- Potassium atoms become free to move when water is added.
- Only non-metal ions move when potassium iodide dissolves.
- Oppositely charged ions move freely when potassium iodide dissolves.
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