Question

In the electrolysis of water:

(i) Name the gas collected at the cathode and anode respectively.
(ii) Why the volume of one gas, collected at one electrode is double than that at the other? Name this gas.
(iii) How will you test the evolved gases ?​

Answer 1

Answer:

I) the gas collected on cathode is hydrogen and on anode is oxygen

H2O ____ H2+ O2

2) the volume of hydrogen gas is double to that of oxygen

3) test for hydrogen gas:

bring a burning splinter near the gas it burns with blue flame and popping sound

Test for oxygen gas:

bring a burning splinter near it the splinter burns more violently

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Answer 2

Answer:

In electrolysis of water :

a ) . Hydrogen gas collected at cathode. And oxygen gas gas collect at anode.

b ) . We know that in water there is 2 hydrogen atom and 1 oxygen atom. That's why volume of gas collected at one electrode double than the other.

c ) . Pure water is a bad conductor of electricity when we add drops of dil sulphuric acid we make it a good conductor of electricity.