Consider the reactions:
a. `H_(3)PO_(2)(aq)+4AgNO_(3)(aq)+2H_(2)O(l) rarr H_(3)PO_(4)(aq)+4Ag(s)+4HNO_(3)(aq)`
b. `H_(3)PO_(2)(aq)+2CuSO_(4)(aq)+2H_(2)O(l) rarr H_(3)PO_(4)(aq)+2Cu(s)+H_(2)SO_(4)(aq)`
c. `C_(6)H_(5)CHO(l)+2[Ag(NH_(3))_(2)]^(o+)(aq)+3overset(Θ)(OH)(aq) rarr C_(6)H_(5)COO^(Θ)(aq)+2Ag(s)+4NH_(3)(aq)+2H_(2)O(l)`
d. `C_(6)H_(5)CHO(l)+2Cu^(2+)(aq)+5overset(Θ)(O)H(aq) rarr` No change observed
What inference do you draw about the behaviour of `Ag^(o+)` and `Cu^(2+)` from these reaction?

Explanation

Reaction (a) and (b) infer that `H_3PO_2` (hypophosporus acid) is a reducing agent and respectively. This also means that both `AgNO_3 and CuSO_4` act as oxidising agent and oxidise `H_3PO_2 " to "H_3PO_4` (phosphoric acid ) .
Reaction (c) indicate that `[Ag(NH_3))_2]^(+)` oxidises `C_6H_5CHO` (benzaldehyde) to `C_6H_6COO^(-)` (benzoate ion) but reaction (d) indicates that `Cu^(2+)` , ions cannot oxidise `C_6H_5CHO " to " C_6H_5COO^(-)` . Thus , we can infer from the above reactions that `Ag^(+)` ion is a stronger oxidising agent than `Cu^(2+)` ion.