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Potential for some half cell reactions a...

Potential for some half cell reactions are given below. On the basis of these mark the correct answer.
(i) `H^(+)(aq) + e^(-) rightarrow (1/2)H^(2)(g)` `E_(cell)^(@) = 0.00V`
(ii) `2H_(2)O(l) rightarrow O_(2)(g) + 4H^(+)(aq) + 4e^(-)`, `E_(cell) = 1.23V`
(iii) `2SO_(4)^(2-)(aq) rightarrow S_(2)O_(8)^(2-)(aq) + 2e^(-), E_(cell)^(@) = 1.96V`

A

In dilute sulphuric acid solution, hydrogen will be reduced at cathode.

B

In concentrated sulphuric acid solution, waer will be oxidised at anode.

C

In dilute sulphuric acid solution, water will be oxidised at anode.

D

in dilute sulphuric acid solution, `SO_(4)^(2-)` ion will be oxidised to tetrathionate ion at anode.

Text Solution

Verified by Experts

The correct Answer is:
C
Indilute `H_(2)SO_(4)`, (acidulated water), `H^(+)` ions are reduced to `H_(2)` at cathode, i.e., (a) and `H_(2)O` is oxidized to `O_(2)` at anode i.e., (c) reaction (iii) occurs when `H_(2)SO_(4)` is concentrated
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Potential for some half cell reactions are given below. On the basis of these mark the correct answer. (i) H^(+)(aq) + e^(-) rightarrow (1/2)H^(2)(g) E_(cell)^(@) = 0.00V (ii) 2H_(2)O(l) rightarrow O_(2)(g) + 4H^(+)(aq) + 4e^(-) , E_(cell) = 1.96V (iii) 2SO_(4)^(2-)(aq) rightarrow S_(2)O_(8)^(2-)(aq) + 2e^(-), E_(cell)^(@) = 1.96V

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