1.

Among the following compound s that is bothparamagnetic and colouredis

Answer»

`K_(2)Cr_(2)O_(7)`
`(NH_(4))_(2)[TiCl_(6)]`
`VOSO_(4)`
`K_(3)[Cu(CN)_(4)]`

Solution :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)):}`


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