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Out of the ions Zn^(2+), Ni^(2+) and Cu^...

Out of the ions `Zn^(2+), Ni^(2+)` and `Cu^(3+)` (At. Nos. Zn=30 Ni=28, Cr=24)

A

only `Zn^(2+)` is colourless and `Ni^(2+)` and `Cr^(3+)` are coloured

B

all three are colourless

C

all three are coloured

D

only `Ni^(2+)` is coloured and `Zn^(2+)` and `Cr^(3+)` are colourless

Text Solution

Verified by Experts

The correct Answer is:
A
`{:("Ion","Electronic","Unpaired"),(,"configuration","electrons"),(Zn^(2+),3d^(10),0),(Ni^(2+),3d^(8),2),(Cu^(3+),3d^(8),2):}`
`Ni^(2+) and Cu^(3+)` have partly filled d - orbital thus coloured but `Zn^(2+)` has completely filled d- orbital, thus colourless.
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Knowledge Check

  • Of the ions Zn^(2+),Ni^(2+) and Cr^(3+) (atomic number Zn=30,Ni=28,Cr=24):

    A
    Only `Zn^(2+)` is colourless and `Ni^(2+) and Cr^(3+)` are coloured.
    B
    all three are colourless.
    C
    all three are coloured
    D
    only `Ni^(2+)` is coloured and `Zn^(2+)` and `Cr^(3+)` are colourless.

  • Of the ions Zn^(2), Ni^(2 +) and Cr^(3 +) [atomic number of Zn = 30, Ni = 28, Cr = 24 ]

    A
    Only `Ni^(2+)` is coloured and `Zn^(2+)` and `Cr^(3+)` are colourless
    B
    All three are colourless
    C
    All three are coloured
    D
    Only `Zn^(2+)` is colourless and `Ni^(2+)` and `Cr^(3+)` are coloured

  • Of the ions Zn^(2+), Ni^(2+), "and" Cr^(3+) ____________.

    A
    `Zn^(2+)` is colourless and `Ni^(2+)` and `Cr^(3+)` are coloured
    B
    all three are coloured
    C
    all three are colourless
    D
    `Ni^(2+)` is coloured and `Zn^(2+) "and" Cr^(3+)` are colourless

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