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In balancing the half reaction, S(2)O(3)...

In balancing the half reaction, `S_(2)O_(3)^(2-)toS`, the number of electrons that must be added is :-

A

4 on the left

B

3 on the right

C

2 on the left

D

2 on the right

Text Solution

Verified by Experts

The correct Answer is:
A

In this reaction 4 electrons are needed for the reaction volume.
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Read the following passage for the evaluation of E^(@) when different number of electrons are involved. Consider addition of the following half reactions (1) Fe^(3+)(aq)+3e^(-)rarr Fe(s) E_(1)^(@)=0.45V (2) Fe(s)rarr Fe^(2+)(aq)+2e^(-) E_(2)^(@)=-0.04V (3) Fe^(3+)(aq)+e^(-)rarr Fe^(2+)(aq) E_(3)^(@)= ? Because half-reactions (1) and (2) contains a different number of electrons, the net reaction (3) is another half-reaction and E_(3)^(@) can't be obtained simply by adding E_(1)^(@) and E_(3)^(@) . The free - energy changes however, are additive because G is a state function : Delta G_(3)^(@)=Delta G_(1)^(@)+Delta G_(2)^(@) Standard electrode potential for the half-cell Fe^(3+)//Fe^(2+) of the reaction (3) is :