Question

The elements of the three transition series of the d-block are given below `:`
`{:(Sc,Ti,V,Cr,Mn,Fe,Co, Ni,Cu,Zn),(Y,Zr,Nb,Mo,Tc,Ru,Rh,Rd,Ag,Cd),(La,Hf,Ta,W,Re,Os,Ir,Pt,Au,Hg):}`
In any transition, as we move from left to right,the d-orbital sare progressively filled and their properties vary accordingly .
Which of the following pair of compounds is expected to exhibit same colour in aqueous solution ?
A. `FeCl_(2) CuCl_(2)`
B. `VOCl_(2), CuCl_(2)`
C. `VOCl_(2), FeCl_(2)`
D. `FeCl_(2),MnCl_(2)`

Answer 1

Both `V^(4+)` and `Cu^(+)` have one unpaired electron in the d-orbital. `V^(4+) = [Ar] 3d^(1) , Cu^(+) = [Ar] 3d^(9)`