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20. Account for following with reasons:(i) Zn +2 salts are white but Cu+2 salts are blue.(ii) Transition elements form interstitial com-pounds.(iii) Transition metals show catalytic properties. |
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Answer» i) Cu2+ has an unpaired electron (its configuration is [Ar] 3d9), whereas Zn2+ has all paired electrons (configuration [Ar] 3d10). Pairing electrons leads to diamagnetism, and unpaired electrons leads to paramagnetism. Also, the unpaired electron in the copper ion allows electron transition in the visible region to take place, so the ion is coloured. ii) Transition metals are large in size and contain lots of interstitial sites. Transition elements can trap atoms of other elements (that have small atomic size), such as H, C, N, in the interstitial sites of their crystal lattices. The resulting compounds are called interstitial compounds. i iii) |
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