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Q.

During the electrolysis of aqueous solution of the following, molarity of the solution increases without changing the chemical composition

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a

NaCl

b

HCl

c

CuSO₄

d

H₂SO₄

answer is D.

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Detailed Solution

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When aqueous solution of H₂SO₄ is electrolyzed, the electrolytic reactions are ,
$At cathode : 2 H^{+} + e^{-} \to H_{2} At anode : H_{2} O \to 2 H^{+} + \frac{1}{2} O_{2} + 2 e^{-}$
Hence, moles of H₂SO₄ remains same .
As the electrolytic process decomposes the water , the moles of water decreases.
Therefore, molarity of H₂SO₄ increases.

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