Which of the following pairs has a similar magnetic moment?

The number of unpaired electrons in chromic ion $(Cr^{3+})$ is (atomic number of $Cr = 24$)

Match the statements given in List-$I$ with the oxidation states given in List-$II$:

List-$I$	List-$II$
$A$. Oxidation state of $Mn$ in $MnO_2$	$i$. $+2$
$B$. Most stable oxidation state of $Mn$	$ii$. $+3$
$C$. Maximum stable oxidation state of $Mn$ in oxides	$iii$. $+4$
$D$. Characteristic oxidation state of Lanthanoids	$iv$. $+5$
	$v$. $+7$

Why are the $E^o$ values for $Mn^{2+}/Mn$,$Zn^{2+}/Zn$,and $Ni^{2+}/Ni$ more negative than expected? The table below provides the values:
| $E^o_{Mn^{2+}/Mn}$ | $E^o_{Zn^{2+}/Zn}$ | $E^o_{Ni^{2+}/Ni}$ |
| :--- | :--- | :--- |
| $-1.18 \ V$ | $-0.76 \ V$ | $-0.25 \ V$ |

Which of the following represents the decreasing order of the second ionization enthalpy $(I.P_2)$?

The correct order of ionic radii for $Y^{3+}$,$La^{3+}$,$Eu^{3+}$,and $Lu^{3+}$ is: