(b)
(c)
(d)
(e)
(f)
Answer:
(a) In this reaction, HCI has been oxidized to CI2
(Removal of H) and
has
been reduced to 
(Removal
of O). Hence,is
the oxidizing agent (oxidant)
(b) Mg has been oxidized to
(Addition
of O). Hence, O2 is the oxidant.
(c) This reaction occurs as
Here
has
gained two electrons to form Cu. Hence,has
been reduced to Cu.
But Zn has donated two electrons to form
.
Hence, Zn has been oxidized to.
Thus, 
is
the oxidizing agent.
(d) Ca has been oxidized to
(Addition
of oxygen), whereas
has
been reduced to V. Hence,is
the oxidant.
(e) Fe has been oxidized to
whereas
H2O has been reduced to Hg. Hence, H2O is the oxidant.
(f)
has
been reduced to Cu whereas H2 has been oxidized to H2O.
Hence,is
the oxidant.
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