Answer:
Oxidation
state of V = + 5 Group VB (5)
Oxidation
state of Cr = + 6 Group VIB (6)
Oxidation
state of Mn = + 7 Group VIIB (7)
All the above oxoanions of maximum oxidation states of
their respective groups, hence, can be reduced to lowest state. Thus, they can
gain electrons.
Thus, oxidising power is in order
Stability of lower oxidation state being in order [1]
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