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Why are the compound of transition elements coloured? |
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Answer» Solution :(i) Transition metal ions absorb a particular electromagnetic RADIATION of white light and its complementary COLOUR is transmitted. Example : `Cu^(2+)` ions absorb red colour and transmit blue colour. (ii) The unpaired ELECTRONS present in the d-orbitals of transition metal ions undergo d-d transition by absorbing the ENERGY of CERTAIN electromagnetic radiation. Example : `Cu^(2+)`ion in water absorb red coloured radiation for d-d transitions of electrons. Hence it transmits blue colour. |
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