Q34. The number of ions from the following that are expected to behave as oxidising agent is :\\
$\mathrm { Sn } ^ { 4 + } , \mathrm { Sn } ^ { 2 + } , \mathrm { Pb } ^ { 2 + } , \mathrm { Tl } ^ { 3 + } , \mathrm { Pb } ^ { 4 + } , \mathrm { Tl } ^ { + }$\\
(1) 3\\
(2) 2\\
(3) 1\\
(4) 4