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Comparing La(OH)_(3) and Lu(OH)_(3), which is more basic and explain why? |
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Answer» Solution :(i) Due tolanthanidecontrationthe size of`La^(3+)` ionsdecreasesregularlywithincreasesin atomicnumber . (ii)According toFajan'sruledecrease insizeof `Ln^(3+)` ionsincreasethe covalentcharacterand decreasesthe basiccharacterbetween`Ln^(3+)` & `OH^(-)` ion in`Ln (OH)_(3)`. (iii)Sincethe ORDEROF size`Ln^(3+)` ionsare `La^(3+) gt CE^(3+) ...... gtLu^(3+)` (iv) Hence `La(OH)_(3)` is the strongestgase while`Lu(OH)_(3)` is theweakest base. |
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