Question

which gas is collected at cathode and how it is checked

Answer 1

while electoplating the positive gas is always collected at cathode. We can check it by doing electroplating .




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Answer 2

Solution:

In the electrolysis of water, hydrogen gas is collected at cathode.

In order to know whether the evolved gas is hydrogen or not, one has to bring burning splinter near it.

If the gas burns with the pop sound, it is hydrogen, if the splinter glows brightly, it is oxygen.