1.

Which one of the following statements related to lanthanons is correct ?

Answer»

All the lanthanons are much more reactive than aluminium
`Ce^(+4)` SOLUTION are widely used as oxidizing agent in volumetric analysis
Europium shows +2 oxidation state
The basicity decreases as the ionic radius decreases from Pr to Lu

Solution :(A) Lanthanon.s are less reactive than aluminium due to high IP (Lanthenoid contraction)
(B) `Ce^(+4)` is good oxidising agent and easily converted into `Ce^(+3)`
(C ) Eu (63) = `4f^(7) 5d^(0) 6s^(2), Eu^(+2)= 4f^(7)`
(D) In lanthenoids SERIES .Ce. to Lu ionic radius regular decrases and covalent character increase, basic character of hydroxide decrease.


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