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Crystalline and Amorphous Solid

The total num...

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The total number of voids in face centred unit cell is a. 4 b. 8 C. 10 d. 12

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The total number of tetrahedral voids in the face centred unit cell is ................

(a) 6 (b) 8 (c) 10 (d) 12

Q. The total number of tetrahedral voids in the face centred unit cell is _______.
[1 Mark]

Q. The total number of tetrahedral voids in face centered unit cell is ______.

Q. Match the List-I with List-II and List-III:

List-I (Solids)	List-II (Unit cell)	List-III (Coordination number)
(a) Rock salt	(p) Face-centred cubic, anion in tetrahedral void	(w) 6
(b) Fluorite	(q) Face-centred cubic, cation in octahedral void	(x) Cation (8), anion (4)
(c) Agl, ZnS	(r) Face-centred cubic, cation in alternate tetrahedral void	(y) Cation (4), anion (8)
(d) $N a_{2} O$	(s) Face-centred cubic, cation in tetrahedral void	(z) Cation (4), anion (4)

Q. Assertion (A): Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four. Reason (R): Besides the body centre, there is one octahedral void present at the centre of each ofthe six faces of the unit cell and each of which is shared between two adjacent unit cells.

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