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Which of the following ions is the most ...

Which of the following ions is the most stable in aqueous solution ?
`(At . No . Ti = 22, V = 23, Cr = 24, Mn = 25)`

A

`Mn^(2+)`

B

` Cr^(3+)`

C

`V^(3+)`

D

`Ti^(3+)`

Text Solution

Verified by Experts

Out of the given species, `Cr^(3+)` has the highest negative reduction potential.Hence, it cannot be reduced to `Cr^(2+)` and, therefore, is the most stable ion in aqueous solution.
Alternatively,
`Mn^(3+) = [ AAr] 3d^(4) , Cr^(3+)= [Ar]3d^(3)`
`V^(3+) =[Ar]3d^(2)Ti ^(3+) = [ Ar] 3d^(1)`
In `Cr^(3+)`, all three d electrons enter into lower energy `t_(2g)` orbitals. The lowering of energy is maximum and hence stability is maximum.
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Knowledge Check

  • Which of the following ion is the most stable?

    A
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    B
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  • Which of the following ions is most stable?

    A
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    B
    `CH_(3)overset(+)CHCH_(2)CH_(3)`
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    D
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  • Which of the following ion is most stable ?

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    B
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    C
    `CH_(3)-overset(+)underset(CH_(3))underset(|)C-CH_(3)`
    D
    `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-overset(+)CH_(2)`

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