In the scheme given below, X and Y , respectively, are array ll Metal halide aq. NaOH &…

In the scheme given below, X and Y, respectively, are
\[\begin{array}{ll} \text { Metal halide } \xrightarrow{\text { aq. } \mathrm{NaOH}} & \begin{array}{c} \text { White precipitate }(P) \\ + \\ \text { Filtrate }(Q) \end{array} \\ P \xrightarrow[\text { heat }]{\substack{a q . \mathrm{H}_{2} \mathrm{SO}_{4} \\ \mathrm{PbO}_{2} \text { (excess) }}} X & \text { (a coloured species in solution) } \\ Q \xrightarrow[\text { warm }]{\mathrm{MnO}(\mathrm{OH})_{2},} \text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4} \\ Q & \begin{array}{l} \text { (gives blue-colouration with } \\ \text { KI-starch paper) } \end{array} \end{array}\]