The P-Block Elements

As we move down the group, the ionisation energy decreases, due to increase in atomic size, thereby, increasing the distance of the electrons from the nucleus. The first ionisation energy of lead is slightly higher than that of tin. The reason is due to lanthanide contraction.Due to higher charge density, the outer electrons are attracted more by the nucleus in lead and hence, the ionisation energy is more in the case of lead.

C > Si > Ge > Pb > Sn

Melting Points (in K)
C Si Ge Sn Pb
4373 1693 1218 505 600
Correct order will be
C > Si > Ge > Pb > Sn

Sn atomic number 50 has least Melting point

In has lowest I.E and most stable oxidation state is + 3

Ge has highest I.E and most stable oxidation state is + 4

(A), (B), (D) and (E) only

C > Si > Ge > Pb > Sn

\begin{array}{|l|l|l|l|l|l|}
\hline \text { Melting point/K } & C-4373 & Si-1693 & Ge-1218 & Sn-505 & Pb-600 \\
\hline
\end{array}