what gas is given out at cathode and anode ? how do you test these gases ?
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Answer:
chlorine gas is liberated at the anode.
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At cathode, H
2
is evolved and at anode O
2
is evolved.
At cathode, H
+
ion takes two electron to convert itself into H
2
gas. 2 moles of H
+
gives 1 mole of H
2
.
2H
+
(aq)+2e
−
→H
2
(g)
At anode, OH
−
ion releases two electrons to convert into water and O
2
. 2 mole OH
−
gives 0.5 mole O
2
, i.e why volume of one gas collected at one electron is double of another.
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