When a dilute solution of salt is electrolyzed, a colourless gas is given off at the anode. The gas is:
Correct answer: B. Oxygen
- A. Hydrogen
- B. Oxygen
- C. Steam
- D. Chlorine
Explanation
During the electrolysis of a dilute salt solution, water is decomposed. At the anode, hydroxide ions (OH-) are oxidized to produce oxygen gas, which is colourless. This is why oxygen is the correct answer. Hydrogen gas is produced at the cathode, not the anode, making it incorrect for this question. Steam is not a product of the electrolysis process. Chlorine gas, while possible in some electrolysis reactions, is not colourless, making it incorrect as well.
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