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Consider the following ions: 1. Ni^((2+)...

Consider the following ions: 1. `Ni^((2+))` 2. `Co^((2+))` 3. `Cr^((2+))` 4. `Fe^((3+))` (Atomic number : `Cr: 24`, `Fe=26, Co=27` and `Ni=28`
The correct sequence of increasing numbr of unpaired elecrons in these ions is `1,2,3,4`; `4,2,3,1`; `1,3,2,4`; `3,4,2,1`

A

1,2,3,4'

B

4,2,3,1'

C

1,3,2,4'

D

3,4,2,1'

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The correct Answer is:
A
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