What happens when you hold up a book and drop it?
2 answers:
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Answer : Half reaction is defined as the reaction which will be <span>either the oxidation or reduction </span>reaction<span> of particular species in a given redox </span>reaction<span>.
So as per the definition in the reaction of,
</span>
<span>
</span>
<span>
here on left and right side </span>
will get cancelled.
and we will get,
Here,
...this is oxidation reaction as Ba is getting reduced to 
by losing 2 electrons.
whereas,on the other hand,
...this is reduction reaction as 
is getting reduced to Zn by gaining 2 electrons.
So as per the definition in the reaction of,
</span>
<span>
</span>
<span>
here on left and right side </span>
and we will get,
Here,
whereas,on the other hand,