Answer:
Thermodynamic factor
has a major role in selecting the reducing agent for a particular reaction.
Only that reagent will be preferred which will lead to decrease in the free
energy 
at a certain specific temperature
e.g., can reduce ZnO to Zn but not CO.
?(i)
?(ii)
In the first case,
there is increase in the magnitude of 
while n the second case, it almost
remains the same. In other words, 
will
have more negative value in the first case when C(s) is the reducing agent than
in the second case when CO(g) acts as the reducing agent. Therefore, C(s) is a
better reducing agent.
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