Which of the following is incorrect about Tetraaquadithiocyanato-s cobalt(III) tris(oxalato)cobaltate(III)

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formula of the complex is $[Co {(H_{2} O)}_{4} (SCN)_{2}] [Co {(ox)}_{3}]$

It is a chelating complex and show linkage isomerism.

It shows geometrical isomerism.

It shows optical isomerism.

answer is A.

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Detailed Solution

(1) The formula of the complex Tetra ammine dithio cyanato-s cobalt(III) tris(oxalato)cobaltate (III) is [CoIII(SCN)₂(NH₃)₄]₃[Co III(ox)₃] and not [Co(SCN)₂(NH₃)₄][Co(ox)₃] because to balance the charge, three units of complex cation and one unit of complex anion are present in one formula unit.
Thus option 1 is incorrect.
(2) Linkage isomerism is possible as SCN ligand is ambidentate ligand and has two donor atoms N and S.
Thus option 2 is correct.
(3) The complex ion [Co(ox)₃]³⁻ has elements of asymmetry and is optically active.
Thus option 3 is correct.
(4) The complex cation [Co(SCN)₂(NH₃)₄]⁺¹ shows geometrical isomerism.
Thus option 4is correct.