A mixture `x` containing 0.02 mol of `[Co(NH_(3))_(5) SO_(4)]Br` and 0.02 mol of `[Co(NH_(3))_(5)Br]SO_(4)` was prepared in `2 L` of solution.
`1 L` of mixture `X + ` excess `AgNO_(3) rarr Y`
`1 L` of mixture `X +` excess `BaCl_(2) rarr Z`
The number of moles of `Y` and `Z` are

Explanation

Only 1st complex will form a precipitate of AgBr and only 2nd complex will form precipitate of `BaSO_(4)`
`underset(0.02mol("in 2L"))([Co(NH_(3))_(5)SO_(4)])Br+AgNO_(3)rarr[Co(NH_(3))_(5)SO_(4)]NO_(3)+underset(0.02 mol)(AgBr(Y))`
`underset("0.02 mol"("in 2L"))([Co(NH_(3))_(5)Br])SO_(4)+BaCl_(2)rarr[Co(NH_(3))_(5)Br]Cl_(2)+underset("0.02 mol")(BaSO_(4))(Z)`
Hence, with 1 L of the solution 0.01 mol of Y and 0.01 mol of Z will be formed.