[" (b) Give reasons: "],[" (i) In stoichiometric defects,NaCl exhibits Schottky defect and not Frenkel defect."],[" (ii) Silicon on doping with Phosphorous forms n-type semiconductor."],[" (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic "],[" substances."]

(a) Calculate the number of unit cells in 8.1g of aluminium if it crystallizes in a f.c.c., structure. (Atomic mass of AI = 27 g mol^(-1) ) (b) Given reasons: (i) In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect. (ii) Silicon on droping with Phosphorus forms n-type semiconductor. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Ferrimagnetic substance show better magnetism than antiferromagnetic Substances. Why ?

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

Give reasons : (i) In stoichiometric dfects. NaCl exhibits Schottky defect and not Frenkel defect. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Give reasons : (i) In stoichiometric dfects. NaCl exhibits Schottky defect and not Frenkel defect. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Give reasons : (i) In stoichiometric dfects. NaCl exhibits Schottky defect and not Frenkel defect. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

The substance showing both Schottky defect and Frenkel defect is AgBr//ZnS .

Identify the non-stoichiometric defect i) Schottky defect ii) Frenkel defect iii) Interstitial defect iv) Metal deficiency defect