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Chemistry Question on Chemical bonding and molecular structure

Which group contains coloured ions out of 1. Cu2+Cu^{2+} 2.Ti4+Ti^{4+} 3. Co2+Co^{2+} 4. Fe2+Fe^{2+}

A

1,2,3,4

B

1,3,4

C

2,3

D

1,2

Answer

1,3,4

Explanation

Solution

Cu2+[Ar]3d9,Ti4+[Ar]3d0Cu^{2+} \left[Ar\right]3d^{9}, Ti^{4+} \left[Ar\right] 3d^{0}
CO2+[Ar]3d7,Fe2+[Ar]3d6CO^{2+} \left[Ar\right]3d^{7} , Fe^{2+} \left[Ar\right]3d^{6}
1,3,4 are coloured ions hence the answer is b.