CH-1737
Electrolysis of solutions
Chemistry · Secondary 4 · Medium · Electrolysis of solutions
During the electrolysis of aqueous copper(II) sulfate using graphite electrodes, a colourless gas is produced at the anode. Which test and observation correctly identify this gas?
- Place a glowing splint at the mouth of the test tube; the splint relights.
- Bubble the gas through limewater; limewater turns milky.
- Place a damp blue litmus paper near the gas; it turns red and then is bleached.
- Place a lighted splint at the mouth of the test tube; a pop sound is heard.
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