A) Most characteristic oxidation state of lanthanides elements is +3
B) All lanthanides are metals
C) The ionic radii of trivalent lanthanide steadily increase with increase in atomic number
D) Lanthanides are separated from one another by ion exchange methods
Correct Answer: C
Solution :
Lanthanoids The series involving the filling of 4\[f\]-orbitals following lanthanum La(Z = 57) is called lanthanoid series. The elements present in the series are called lanthanoids. Some general characteristics of lanthanoids are following All lanthanoids exhibit a common stable oxidation state. The steady decrease in atomic and ionic sizes of lanthanide elements with increasing atomic number is called lanthanoid contraction. The ionic radii decreases from \[C{{e}^{3+}}\] to \[L{{u}^{3+}}\] ions. All the lanthanoids are silvery white soft metals. Lanthanoids are chemically similar. It is difficult to separate them by chemical reaction. They are separated by ion exchange methods.
You need to login to perform this action.
You will be redirected in
3 sec
