Among the following the compound that is both paramagnetic and coloured is

Options

A. `K_(2)Cr_(2)O_(7)`
B. `(NH_(4))_(2)[TiCl_(6)]`
C. `VOSO_(4)`
D. `K_(3)[Cu(CN)_(4)]`

Explanation

For a compoun to be coloured, the central atom should have incompletely filled d-orbital and to be a pramagnetic , there should be at least one unpaired electron Here, we have
`{:("Compound","Central atom","Electronic config."),(K_(2)Cr_(2)O_(7),._(24)Cr(VI),3s^(2)3p^(6)),((NH_(4))_(2)[TiCl_(6)],._(22)Ti(IV),3s^(2)3p^(6)),(VOSO_(4),._(23)V(IV),3s^(2)3p^(6)3d^(1)),(K_(3)[Cu(CN)_(4)],._(29)Cu(I),3s^(2)3p^(6)3d^(10)):}`