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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

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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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