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Colour

Out of the io...

Question

Out of the ions $A g^{+}, C o^{2 +}, T i^{4 +}$ , which one will be coloured in aqueous solutions.

[Atomic no : Ag = 47, Co = 27, Ti = 22]

A g^{+}

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C o^{2 +}

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T i^{4 +}

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None of these

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Solution

The correct option is B $C o^{2 +}$
compound with unpaired d-electron will show color.

$A g^{+} = 5 d^{10}, n = 0$

$T i^{+ 4} = 3 s^{2} 3 p^{6}, n = 0$

$C o^{+ 2} = [A r] 3 d^{7}, n = 3$ It will show color due to unpaired d electrons.

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