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(a) of the ions A^(+),CO^(2+) and Ti^(+)...

(a) of the ions `A^(+),CO^(2+)` and `Ti^(+)`, which one will be coloured in aqueous solution? (Atomic no. s: Ag=47,Co=27,Ti=22)
(b) If each ore each one of the above ionic species is in turn placed in a magnetic field, how will it respond and why?

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The correct Answer is:
(a) `CO_(2+)` will be coloured because it contains unpaired electrons. On the other hand ,`Ag^(+)` has completely filled `3d` subshell and `Ti^(4+)` has empty `3d` subshell, therefore , they will be coloureless.
(b) `Co^(2+)` will be attracted by a magnetic field while `Ag^(+)` and `Ti^(4+)` ions will be repelled.
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Knowledge Check

  • In which of the following paris both the ions are coloured in aqueous solution? (Atomic number, Sc - 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

    A
    `Ni^(2+)` and `Cu^(+)`
    B
    `Sc^(3+)` and `Ti^(3+)`
    C
    `Sc^(3+)` and `Co^(2+)`
    D
    `Ni^(2+)` and `Ti^(3+)`

  • Which of the following pair are both the ions coloured in aqueous solution ("At. no." Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

    A
    `Sc^(3+), Co^(2+)`
    B
    `Ni^(2+),Cu^(+)`
    C
    `Ni^(2+),Ti^(3+)`
    D
    `Sc^(3+),Ti^(3+)`

  • Form the following species, Ti^(3+),V^(3+),Sc^(3+),Fe^(3+),Co^(3+), Cu^+ and Mn^(3+) , Which two will not be coloured in aqueous solution ?

    A
    `Mn^(3+)` and `Co^(3+)`
    B
    `V^3 ` and ` Co^(3+)`
    C
    `TI^(3+) `and `Sc^(3+)`
    D
    `Sc^(3+)`and `Cu^+`
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