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In 1800, William Nicholson passed an electric current through water and observed two gases formed at the electrodes. Which gas is formed at the electrode connected to the POSITIVE terminal of the battery?
AOxygen
BNitrogen
CCarbon dioxide
DHydrogen
Answer & Solution
Correct answer: A. Oxygen
In Nicholson's experiment (electrolysis of water): oxygen bubbles form at the positive electrode (anode), hydrogen bubbles at the negative electrode (cathode). The volume of hydrogen produced is roughly twice that of oxygen, matching the H : O ratio of 2 : 1 in water (H₂O).
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