STRUCTURE OF IONIC COMPOUNDS -- Quiz

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Question 1.

CaS exists in a cubic close packed arrangement of S^2- ions in which Ca²⁺ ions occupy 1/2 of the available tetrahedral holes. How many Ca²⁺ and S^2- ions are contained in the unit cell?

a)   2, 4
b)   4, 2
c)   2, 2
d)   4, 4
e)   1, 1

Question 2.

CsBr forms a simple cubic lattice in which Br^- are at the corners of the unit cell. If the density of CsBr is 4.428 g/cm³, calculate the length of the unit cell.

a)   0.383 nm
b)   0.492 nm
c)   0.298 nm
d)   0.431 nm
e)   0.342 nm

Question 3.

ZnS exists in a cubic close packed arrangement of S^2- ions in which Zn²⁺ ions occupy 1/2 of the available tetrahedral holes. How many Zn²⁺ and S^2- ions are contained in the unit cell?

a)   2, 4
b)   4, 4
c)   2, 2
d)   4, 2
e)   1, 1

© 1995, R.J. Tatz
The Ohio State University Dept. of Chemistry BETHA Project