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Question

In electrolysis of water, why is the volume of gas collected over one electrode double the volume of gas collected over the other electrode?


Your Answer
A
Because cathode is stronger than anode
Your Answer
B
Because oxygen is twice as hydrogen
Correct Answer
C
Because hydrogen is twice as oxygen
Your Answer
D
Because oxygen is more electronegative.

Solution

The correct option is D Because hydrogen is twice as oxygen
We usually perform electrolysis to split the constituents of water. Water is composed of 2 atoms of H and 1 atom of O. Therefore the amount of H is double than that of O. The two electrodes collect H2 and O2 separately, therefore, the volume of gas collected in one electrode is double the volume of gas collected in the other electrode.

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