Which of the following metals exhibits multiple oxidation states?

A) Al
B) Cs
C) V
D) Ca
E) Zn

Answer:
C)
Vanadium occurs with the oxidation states 0,+1,+2,+3,+4,+5

The other metals have only one state of oxidation beside 0:
Aluminum +3
Caesium +1
calcium +2
Zinc +2
These are all metals. As metals they will have an oxidation state of Zero. In addition, in chemical combination, the following oxidation numbers (states) are common

Al +3
Cs +1
V +1, +2, +3, +4, +5 and -1
Ca +2
Zn +2

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