Answer:
(a) 
gas is collected at the cathode and 
gas is at anode.
(1)
(b) The gas which is collected in double the amount in the electrolysis
of water experiment is hydrogen. This is because 
contains
2 parts of hydrogen element and 1 part of oxygen element by volume.
(1)
(c) Hydrogen gas burns with a pop sound when the burning
splinter is brought near the gas. If a smoulding match stick is brought in
contact with oxygen gas, it starts burning brightly.
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