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# Predict the products of electrolysis in each of the following: A dilute solution of H2SO4with platinum electrodes. - CBSE (Science) Class 12 - Chemistry

ConceptElectrolytic Cells and Electrolysis - Introduction

#### Question

Predict the products of electrolysis in each of the following:

A dilute solution of H2SO4with platinum electrodes.

#### Solution

At the cathode, the following reduction reaction occurs to produce H2 gas.

H_(" "(aq))^+ + e^(-) -> 1/2 H_(2(g))

At the anode, the following processes are possible

2H_2O_(l) ->O_(2(g)) +  4H_(" "(aq))^(+) + 4e^(-); E^@ = +1.23 V ....(i)

2SO_(4(aq))^(2-) -> S_2O_(6(aq))^(2-) + 2e^(-); E^@ = + 1.96 V.... (ii)

For dilute sulphuric acid, reaction (i) is preferred to produce O2 gas. But for concentrated sulphuric acid, reaction (ii) occurs.

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 3: Electrochemistry
Q: 18.3 | Page no. 92

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Solution Predict the products of electrolysis in each of the following: A dilute solution of H2SO4with platinum electrodes. Concept: Electrolytic Cells and Electrolysis - Introduction.
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