# (a) Based on the nature of intermolecular forces, classify the following solids : Benzene, Silver(b) $\inline AgCl$ shows Frenkel defect while $\inline NaCl$ does not. Give reason.(c) What type of semiconductor is formed when $\inline Ge$ is doped with $\inline Al$ ?

(a) Benzene - Molecular solid

silver - metallic solid

(b) $\inline AgCl$ shows  Frenkel defect whereas $\inline NaCl$ does not because $\inline Ag^{+}$ is smaller in size than $\inline Na^{+}$ and hence has large difference in the size of ions (i.e, between $\inline Ag^{+}$ and $\inline Cl^{-1}$.)

(c) $\inline \rho -type$ semiconductor is formed when $\inline Ge$ is doped with $\inline Al$.

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