Question

Select the incorrect statement about lanthanides.
a) they form oxides of the type M2O3
b) oxides are basic in nature
c) all lanthanides are paramagnetic in +3 oxidation state
d) lathanides show +2,+3,+4 oxidation state but general oxidation state is +3​

Answer 1

Answer:

c) All lanthanide are paramagnetic in +3 oxidation state

Explanation:

Ions which contain all paired electrons are diamagnetic while those containing unpaired electrons are paramagnetic . Among the lanthanides , La3+ [4f 0] & Lu3+ [4f 14] are diamagnetic. All trivalent lanthanide ions are paramagnetic due to unpaired electrons.

Answer 2

Answer:

a) they form oxides of the type M2O3   ---- this statement is correct about lanthanides becoz mostly lanthanides forms this types of oxides.e.g .Pm₂O₃

b) oxides are basic in nature  --------this statement is correct lanthenides are basics in nature

c) all lanthanides are paramagnetic in +3 oxidation state -----this is a incorrect statement becoz , when it forms componds in its common oxidation state of +3 threee electrons are needed to form the bonds when 3 electrons on the lanthanoids atom are used to form compunds in the most stable oxidation state of +3

d) lathanides show +2,+3,+4 oxidation state but general oxidation state is +3---------------yes this statement is correct . lantheniodes posses +3 oxidation state as a common state.  ​

the correct answer is OPTION C.