A) +1
B) +3
C) +4
D) +6
Correct Answer: B
Solution :
The elements which have partly filled \[4f\] orbitals are called lanthanides or lanthanones. The elements from cerium (58) to Leutetium (71) are lanthanides. General electronic configuration is \[(n-2){{f}^{1-14}}(n-1){{d}^{0-2}}\,n{{s}^{1-2}}.\] Lanthanides show variable oxidation states. +3 is the most important oxidation state.
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