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Question

During electrolysis of acidulated water, which gas is collected at cathode and which gas is collected at anode?



A
Hydrogen, Oxygen
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B
Oxygen, Hydrogen
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C
Hydronium, Hydroxyl
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D
None of the above
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Solution

The correct option is A Hydrogen, Oxygen
Acidulated water is water where some sort of acid is added.
Ionization of acidified water:
         $$H_2O \leftrightharpoons H^+ +OH^-$$
         $$H_2SO_4  \leftrightharpoons 2H^+ + SO_4^{2-}$$

Ions present in solution are $$SO_4^{2-}$$, $$OH^-$$ and $$H^+$$
+ve charge move towards cathode whereas -ve charge move towards anode.

Reaction at cathode:
            $$H^+ + e^- \rightarrow H$$
            $$H+H \rightarrow H_2$$
Reaction at anode
$$OH^-$$ ion discharge in preference to $$SO_4^{2-}$$
              $$OH^- \rightarrow OH +e^-$$
               $$4OH \rightarrow 2H_2O +O_2$$
              
Hence, during electrolysis of acidulated water, hydrogen is collected at cathode and oxygen is collected at anode.

Chemistry

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