100 ml 0.1 M $K_{2}S{O}_3$ and 100 ml 0.1 M $KMn{O}_4/H^{+}$ are mixed and allowed for a complete redox change. Hence ______

Newly formed  $S{O}_4^{-2}$ has 0.05 M concentration

0.02 M $M{n}^{+2}$ ions are present in the final solutions

Some $KMn{O}_4$ is left unreacted

$K_{2}S{O}_3$ is partially left unreacted