Gaseous StateHard
Question
Which of the following statement (s) is (are) correct ?
Options
A.The coordinate number of each type of ion in CsCl crystal is 8
B.A unit cell of an ionic crystal shares some of its ione with other unit cells
C.A metal that crystallizes in bcc structure has a coordinate number of 12
D.The length of the unit cell in NaCl is 552 pm (rNa+ = 95 pm, rCl- = 181pm)
Solution
(a) CsCl has b. c. c lattice, thus co-ordination number of each ion = 8
(b) It is a fact.
(d) NaCl crystal is composed of two inter penetrating f. c. c lattices, one entirely composed of Na+ and another of Cl-. Each Na+ is located at half way between two Cl- and viceversa. For NaCl type structure.
a = 2(rNa+ + rCl-) = 2(95 + 181) = 552 pm
(b) It is a fact.
(d) NaCl crystal is composed of two inter penetrating f. c. c lattices, one entirely composed of Na+ and another of Cl-. Each Na+ is located at half way between two Cl- and viceversa. For NaCl type structure.
a = 2(rNa+ + rCl-) = 2(95 + 181) = 552 pm
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