What is lanthanoid contraction?
(b) Write any one use of lathanoid
(c) \(La(OH)_{2}\) is more basic than \(Lu(OH)_{3}\) .Explain.

Why Ce(OH)_(3) is more basic than Lu(OH)_(3) ?

Explain the following : La(OH)_3 is more basic than Lu(OH)_3

Which out of the two , La(OH)_(3) and Lu(OH)_(3) , is more basic and why?

(a) What is lanthanoid contraction? What is the cause of lanthanoid contraction? (b) Explain whether Cu^(2+) is paramagnetic or diamagnetic.

Explain the following : (a) Out of Sc^(3+), Co^(2+) " and "Cr^(3+) "ions, only "Sc^(3+) is colourless in aqueous solutions. (Atomic no.: Co =27, Sc = 21 and Cr =24) (b) The E^(@)Cu^(2+)//Cu for copper metal is positive (+0.34), unlike the remaining members of the first transition series. (c) La(OH)_(3) " is more basic than Lu "(OH)_(3).

Explain: CH_(2) = CH^(-) is more basic than HC -= C^(-)