Q.

Aqueous solution of Na2SO4 is subjected to electrolysis using inert electrodes. Then the true statement is

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pHprogressively increases

pHprogressively decreases

pHremains unaltered

Cannot be predicted

answer is C.

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Detailed Solution

aq Na2SO4is a salt of SA – SB ∴pH = 7Due to electrolysis: At CathodeDischarge potential of H2Ois lesser than Na+∴2H2O+2e− → H2+2OH−At AnodeDischarge potential of H2O is lesser than SO 4−22H2O → 4H++4e−+O2 Left over solution is concentrated Na2SO4 . Composition doesn’t change but concentration increases. pH of a salt of SA-SB always is 7 irrespective of its concentration.

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