With the help of electron spins, clearly distinguish between Ferromagnetic, Antiferromagnetic and Ferrimagnetic substances.

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

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic? Justify your answer.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic? Justify.

(a) Calculate the number of unit cell in 8.1g of aluminium if it crystallises in a fcc structure. (Atomic mass of Al = 27 g*mol^(-1) ) (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 anti-ferromagnetic substances.

Rank the following magnetic substances in order of their magnetic moments in presence of a magnetic field: Ferrimagnetic, Ferromagnetic, Anti-ferromagnetic

Define: (i) ferromagnetic (ii) ferrimagnetic and (iii) anti-ferromagnetic substance. Give one example of each substance.

(a) Based on the nature of intermolecular forces, classify the following solids: Sodium sulphate, Hydrogen. (b) What happens when CdCl_(2) is doppd with AgCl? ( c) Why do ferrimagnetic substances show better magnetism than antiferromagnetic substances?

Which of the following substances can exist in a permanently magnetised state even when the magnetic field is removed, and why? (i) Paramagnetic (ii) Ferromagnetic (iii) Ferrimagnetic

Which quantum number is to be mentioned to distinguish between the electrons present in the K-shell?