Give one test to differentiate ` [Co(NH_3)_5Cl]SO_4 and [Co(NH_3) _5 SO_4 ]Cl `.

Explanation

(a) `[Co(NH_(3))_(5)Cl]SO_(4)rarr [Co(NH_(3))_(5)Cl]^(+2)+SO_(4)^(2-)`
(b) `[Co(NH_(3))_(5)SO_(4)]Clrarr[Co(NH_(3))_(5)]^(-)+Cl^(-)`
(i) Aqueous solution of (a) gives sulphate ion. When an addition of `BaCl_(2)` solution (a) gives white precipitate of `BaSO_(4)`. but (b) does not give any precipitate.
(ii) Aqueous solution of (b) gives chloride ion. When an addition of `AgNO_(3)` Solution (b) gives curdy white precipitate of `AgCl`. But (a) does not give any precipitate.