Arrange the following elements in the increasing order of the number of unpaired electrons in them.
$A$. $Sc$ $B$. $Cr$ $C$. $V$ $D$. $Ti$ $E$. $Mn$
Choose the correct answer from the options given below:

Consider $|x|$ as the difference in oxidation states of Mn in the highest manganese fluoride and the highest manganese oxide. The ions with $|x|$ number of unpaired electrons from the following are: $A$. $Sc^{3+}$ $B$. $Zn^{2+}$ $C$. $V^{2+}$ $D$. $Fe^{2+}$ $E$. $Co^{2+}$ Choose the correct answer from the options given below:

Which of the following statements is incorrect?

Which of the following metals exhibits more than one oxidation state?

The outer electronic configuration of $Pd$ is

Which of the following metals does not show variable valency?