Number of unpaired electrons in $Mn^{4+}$ is

The $3d-$ elements show variable oxidation states. What is the maximum oxidation state shown by the element $Mn$?

Which of the following is the general electronic configuration of transition elements?

The $I.P.$ values of $Cr, Zn, Mn$,and $Hg$ are $7.4 \ eV, 6.7 \ eV, 10.4 \ eV$,and $9.3 \ eV$. These $I.P.$ values are not listed in the order of the elements. Identify the correct $I.P.$ value for the given elements.

Among the following components of cement,which is present in the highest amount?

The electronic configuration of silver atom in ground state is