# Mixture $X$ containing $0.02\;mol$ of $[CO(NH_3)_5 SO_4]Br$ and $0.02\;mol$ of $[CO(NH_3)_ {Br}]SO_4$ was prepared in $2$ litre of solution . $1$ litre of mixture X+ excess $AgNO_3\; \to\; Y$ $1$ litre of mixture $X+$ excess $BaCl_2 \; \to\; Z$. Number of moles of $Y$ and $Z$ are
$(a)\;0.01,0.01 \\ (b)\;0.02,0.01 \\(c)\;0.01,0.02\\(d)\;0.02,0.02$