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Q.

Which of the following ions are coloured?

I .  Cu+           II.  Ti+4            III.  Co+2            IV.  Fe+2

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An Intiative by Sri Chaitanya

a

I, II, III and IV

b

III, IV only

c

I, II only

d

II, III only

answer is B.

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Detailed Solution

 CO+2→3d7
Unpaired electron = 3
 Fe+2→3d6
Unpaired electron = 4 
 

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