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MHT CET Chemistry question

ChemistryElectrochemistryMHT CET

for some half-cell reactions are given below. On the basis of these mark the correct answer. I. ; II. ; III. ;

Answer: (A)

Solution

In dilute H2SO4 water is plentiful and its oxidation potential (1.23 V) is lower than that of sulphate (1.96 V), so H+ is reduced to H2 at the cathode and water (not sulphate) is oxidised at the anode; (b) is wrong because

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Question ID VK-066969