Published by:
CGP EDU Academic Team
Published on: August 13, 2026
How many electrons appear in the following half reaction when it is balanced)
Text Solution
Verified by ExpertsThe correct answer is:
B
The easiest way to balance these electrons is by balancing the charge. 
, thus adding 
to the left side will balance the charge. It is a bit trickier to try to use oxidation numbers since the S on the left has an oxidation number of 
2.5, and the oxidation number of 
2. This is a change of oxidation state of 
1/2, four times, thus 2 electrons.
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