Question

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

Answer 1

because water is made up of 2 compound of hydrogen and 1 compound of oxygen (H2O)
thats why the gas collection over one electrode is double than that of another electrode during electrolysis of water.
In one electrode it the gas bubbles will be of hydrogen and in another it will be of oxygen...

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Answer 2

whenever electrolysis of water is being done , then hydrogen gas is obtained at the cathode and oxygen gas is obtained at anode . as a result the volume of gas collected at cathode is double the volume of gas collected at anode .

that is hydrogen : oxygen = 2 : 1

this can be proved as following ,

2 WATER = 2 HYDROGEN + 1 OXYGEN

SO , THE VOLUME OF GAS COLLECTED OVER ONE ELECTRODE IS DOUBLE THAN THAT OF GAS COLLECTED OVER THE OTHER ELECTRODE ..