Answers

2014-09-15T21:40:55+05:30
The perfect example demonstrating this is the electrolysis of water.
If we take some water in a beaker and add sulphuric acid to it then it becomes acidulated water and a great conductor of electricity.
Then we pass electric current through them and we see that one test tube has more space than the other.
This proves that water has 2 parts of hydrogen and 1 part of oxygen.
 Oxygen is collected at anode and Hydrogen at Cathode.
                        2H₂O ------------------->  2H₂ + O₂

In fig. Gas A is hydrogen and gas B is oxygen.

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2014-09-15T22:35:47+05:30
You can know it by electrolysis of water.On  electrolysis you will get oxygen at anode and hydrogen at cathod. The volume of the collected hydrogen and oxygen will be 2:1. 
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