Question

Which of the following order regarding the melting point is correct?

• A. $Si>Ge>Pb>Sn$
• B. $Si>Pb>Ge>Sn$
• C. $Ge>Si>Pb>Sn$
• D. none of these

Answer 1

The correct option is A $Si>Ge>Pb>Sn$

Si>Ge>Pb>Sn

Si and Ge has a high rigid solid structure so, it has high melting point.

Pb and Sn forms only 2 bonds due to inert pair effect so has less melting point

Also, going down the group bond strength between atoms decreases, due to the increase in atomic size.

So,melting point decreases down the group