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Which of the following ions will exhibit...

Which of the following ions will exhibit colour in aqueous solution ?

A

`La^(3+)(Z=57)`

B

`Ti^(3+)(Z=22)`

C

`Lu^(3+)(Z=71)`

D

`Sc^(3+)(Z=21)`

Text Solution

Verified by Experts

The correct Answer is:
B
`Ti^(3+)(Z=22)`
Ions which have unpaired electrons exhibit colour in solution. `Ti^(3+)` has an outer electronic configuration of `4s^(0)`, `3d^(1)`, i.e, 1 unpaired electron. Thus its solution will be coloured.
`Sc^(3+) to d^(0)`
In case of `La^(3+)`, `4f^(0)` configuration is present and in `Lu^(3+)`, `4f^(14)` is present. So, there is no possibility of `f-f` transition, hence these ions do not appear coloured.
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Knowledge Check

  • Which of the following ions will exhibit colour in aquesous solution ?

    A
    `La^(3+)(Z=57)`
    B
    `Ti^(3+) (Z=22)`
    C
    `Lu^(3+)(Z=71)`
    D
    `Sc^(3+)(Z=21)`

  • If the colours of salts of transition elements are due to the presence of unpaired electrons in the transition metal ions, which of the following ions will be colourless in aqueous solution

    A
    `Ti^(3+)`
    B
    `Ti^(4+)`
    C
    `Fr^(2+)`
    D
    `Fr^(3+)`

  • Which of the following ions will give a colourless aqueous solution

    A
    `Ni^(2+)`
    B
    `Co^(2+)`
    C
    `Cu_(2)^(2+)`
    D
    `Fe^(2+)`

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    Which of the following pairs does not exhibit colour in solution ?

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