The element that usually does $NOT$ show variable oxidation states is

Given below are two statements $:$
Statement $I : CrO_3$ is a stronger oxidizing agent than $MoO_3$
Statement $II : Cr(VI)$ is more stable than $Mo(VI)$
In the light of the above statements,choose the correct answer from the options given below.

Given below are two statements:
Statement $I$: Ferromagnetism is considered as an extreme form of paramagnetism.
Statement $II$: The number of unpaired electrons in a $Cr^{2+}$ ion $(Z=24)$ is the same as that of a $Nd^{3+}$ ion $(Z=60)$.
In the light of the above statements,choose the correct answer from the options given below:

In which of the following cases,the stability of two oxidation states is correctly represented?

Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

The general electronic configuration of transition elements is