Answer :

(i) The reason for pink colour of LiCl is Metal excess defect due to anionic vacancies filled by free electrons or we can say that it is due to F – centres.


(ii) NaCl shows Schottky defect as there is a very small difference between the ionic radii of Na+ and Cl-.


OR


(i) Tetrahedral void is the void surrounded by 4 constituent particles and it has the shape of a regular tetrahedron while Octahedral void is the void surrounded by 6 constituent particles and an octahedron is formed by them.


The coordination no. of tetrahedral voids and octahedral voids are 4 and 6 respectively.


(ii) Unit cell is the smallest portion of a lattice which is used to describe a lattice while the lattice formed by the repetition of unit cell in three dimensions is called a crystal lattice.


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