Which of the following elements are not regarded as transition elements?

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest $E^{o}_{M^{3+} / M^{2+}}$ value?

Which of the following will be a coloured ion?

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ Transition elements exhibit variable oxidation states.
$(b)$ The $E^o$ values for $Mn, Zn,$ and $Ni$ are more positive than expected from the general trend.
$(c)$ Any metal exhibits its maximum high oxidation state in oxide and chloride compounds.

Choose the element which is not radioactive.

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: