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Select the coloured compound amongst the...

Select the coloured compound amongst the following (atomic no `Ti=22,Cr=24,Cu=29, Zn=30`)

A

`Ticl_(4)`

B

`CrCl_(3)`

C

`ZnCl_(3)`

D

`CuCl`

Text Solution

Verified by Experts

The correct Answer is:
B
`._(22)Ti=[Ar]3d^(2)4s^(2)impliesTi^(4+)[Ar]3d^(0)4s^(3)`(No unpaired electron)
`._(24)Cr=[Ar]3d^(5)4s^(1)impliesCr^(3+)[Ar]3d^(3)`
(Three unpaire electrons)
`._(30)Zn=[Ar]3d^(10)4s^(2)impliesZn^(2+)[Ar]3d^(10)`
(All electrons paired)
`._(29)Cu=[Ar]3d^(10)4s^(1)impliesCu^(+)=[Ar]3d^(10)`
(All electrons paired)
Since, `Cr^(3+)` ion has 3 unpaired electrons, therefore its salt, i.e `CrCl_(3)` will be coloured.
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