Q.

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

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NaCl

HCl

CuSO4

H2SO4

answer is D.

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Detailed Solution

Electrolysis of aq NaClProducts are H2 , Cl2 and NaOH. Composition is changed.Electrolysis of aq HClAt CathodeAt AnodeCell is left with H2O. Composition changed.Electrolysis of aq CuSO4At CathodeAt AnodeCell is left with H2SO4. Composition is changed.Electrolysis of aq.H2SO4At CathodeAt AnodeLeft over in the vessel is H2SO4.Composition remains same.Solution becomes more concentrated molarity increases.

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