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Give reasons for the following:(i) Fe has higher melting point than Cu.(ii) [Ti (H2O)6]3+ is coloured while [Sc(H2O)6] 3+ is colourless. |
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Answer» (i) This is because Fe (3d6 4s2 ) has four unpaired electrons in 3d-subshell. While Cu (3d10, 4s1) only one unpaired electron in 4s shell. Hence metallic bonding is stronger in Fe than those in Cu. (ii) The oxidation state of Ti in [Ti (H2O)6] 3+ is +3 and its configuration is [Ar] 3d1 i.e one unpaired electron and hence it is coloured. Whereas the oxidation state of Sc in [Sc (H2O)6]3+ is +3 and its configuration is [Ar] 3d0 i.e no unpaired electron and hence it is colourless. |
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