$A, B$ and $C$ are three elements which undergo chemical reactions according to the following equations:
$A_{2}O_{3} + 2B \rightarrow B_{2}O_{3} + 2A$
$3CSO_{4} + 2B \rightarrow B_{2}(SO_{4})_{3} + 3C$
$3CO + 2A \rightarrow A_{2}O_{3} + 3C$
$(a)$ Which element is the most reactive?
$(b)$ Which element is the least reactive?
$(c)$ What is the type of reactions listed above?

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(N/A) The most reactive element is $B$ because it displaces both $A$ and $C$ from their respective compounds.
$(b)$ The least reactive element is $C$ because it is displaced by both $A$ and $B$ in the given reactions.
$(c)$ These are displacement reactions,specifically single displacement reactions.

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