Question

(a) Based on the nature of the intermolecular foces, classify solids benzene and silver.
(b) AgCl shows frenkel defect while NaCl does not. Give reason.
(c) What type of semi-conductor is formed when Ge is doped with Al ?

Answer 1

(a) Benzene: Molecular (non-polar)-solid, silver: Metallic-solid
(b) Frenkel defect is shown by those in which there is large difference in the size of cations and anions. Hence, frenkel defect is shown by AgCl due to small size of `Ag^(+)` ion but not by NaCl because alkali metal ions can not fit into interstitial sites.
(c) P-type semiconductor is formed when Ge(gp-14) is dopped with Al(gp-13). One electron hole is created.