The ions from among the following which are colourless are :
(i) Ti 4+ , (ii) Cu +1
(iii) Co 3+ (iv) Fe 2+
Text Solution
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(i) Valence shell electron configuration of Ti 4+ is 3dº 4sº. As there is no unpaired electrons for d–d transition, the solution of ions will be colourless.
(ii) Valence shell electron configuration of Cu + is 3d 10 4sº. As all electrons are paired, there is no d–d transition, so the solution of ions will be colourless.
(iii) Valence shell electron configuration of Co 3+ is 3d 6 4sº. As there are 4 unpaired electrons, there is d–d transition of electron, so the solution of ions will be coloured.
(iv) Valence shell electron configuration of Fe 2+ is 3d 6 4sº. As there are 4 unpaired electrons, there is d–d transition of electron, so the solution of ions will be coloured.
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