Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate ?

Options

A. `[Cr(NH_(3))_(4)SO_(4)]Cl`
B. `[Co(NH_(3))_(4)Cl_(2)]NO_(2)`
C. `[Cr(NH_(3))_(4)Cl_(2)]SO_(4)`
D. `[CrCl_(2)(H_(2)O)_(4)]Cl`

Answer

C

Explanation

When `[Cr(NH_(3))_(4)Cl_(2)]SO_(4)` dissolves it yields `[Cr(NH_(3))_(4)Cl_(2)]^(+2)andSO_(4)^(2-)` ion thus formed reacts with the `Ba^(2+)` ion to form a white precipitate of `BaSO_(4)`.
`Ba^(2+)+SO_(4)^(2-)hArrBaSO_(4)underset("(white precipitate)")underset()underset("Barium sulphate")darr`