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Identify the complexes which are expecte...

Identify the complexes which are expected to be coloured.
a. `[Ti(NO_(3))_(4)]` , b. `[Cu(NC CH_(3))_(4)]^(o+) BF_(4)^(ɵ)`
c. `[Cr(NH_(3))_(6)]^(3+)3Cl^(ɵ)` , d. `K_(3)[VF_(6)]`

A

`[Ti (NO_(3))_(4)]`

B

`[Cu(NCCH_(3))]^(+) BF_(4)`

C

`[Cr (NH_(3))_(6)]^(3+) 3CI^(-)`

D

`K_(3)[VF_(6)]`

Text Solution

Verified by Experts

`In [Ti(NO_(3))_(4)]`, O. N. of Ti is +4.
Hence, in Ti (IV) (1s_(2),2S^(2), 2p^(6),3S^(2), 3p^(6))` incomplete d-orbital is not present. So, itis colourlese.
(B) In [Cu(NCCH_(3))]^(+) BF_(4), O. N. of Cu is +1. Hence, in Cu(I)`[1s^(2), 2s^(2), 2p^(6) 3s^(2), 3p^(6), 3d^(10)]`incomplete d-orbital is not present. So it is also colourless
(C) In `Cr(NH_(3))_(6)]^(3+) 3CI^(-), O.N. of Cr is +3`. Hence, in Cr(III) `(1s^(2), 2s^(2), 2p^(6),3s^(2), 3p^(6) 3d^(3)` incomplete d-orbitals are present. So, it is coloured
(D) In `K_(3) [VF_(6)).O.N. of Vis +3. Hence, in V(III) `(1s^(2), 2s^(2) 2p^(6) 3s^(2), 3p^(6), 3d^(2))` incomplete d-orbital is present, so it is coloured
Hence, (C) and (D) are the correct answers.
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