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Which group contains coloured ions out o...

Which group contains coloured ions out of the following ?
1. `Cu^+` 2. `Ti^(4+)` 3. `Co^(2+)` 4. `Fe^(2+)`

A

1,2,3,4

B

3,4

C

2,3

D

1,2

Text Solution

Verified by Experts

The correct Answer is:
B
Colour of trasition elements are due to presence of unpaired electrons.
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The colourless ion among the following is (A) Mn^(2+) , B) Cu^(+) (C) Cr^(3+) (D) Fe^(2+)

Write down the number of 3d electrons in each of the following ions : Ti^(2+), V^(2+), Cr^(3+), Mn^(2+), Fe^(2+), Co^(2+), Ni^(2+) and Cu^(2+) . Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

Knowledge Check

  • Which group contains coloured ions out of (1) Cu^(+2) (2) Ti^(+2) , (3) Co^(+2) , (4) Fe^(+2)

    A
    1, 2, 3,4
    B
    1, 3, 4
    C
    2, 3, 4
    D
    1,2,3

  • Which of the following groups contain coloured ions out of Cu^(2+), Ti^(4+), Co^(2+) and Fe^(2+) ?

    A
    Only `Cu^(2+), Ti^(4+)`
    B
    `Cu^(2+), Co^(2+), Fe^(2+)`
    C
    `Ti^(4+), Co^(2+)`
    D
    All of these

  • Among the following ions : 1. Cu^(2+) " "2.Ti^(2+) " " Co^(2+) " " 4. Fe^(2+) the coloured ions are

    A
    1,2,3,4
    B
    1,3,4 only
    C
    2,3, only
    D
    1,2 only.

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