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The density of KBr is 2.75 g cm^(-3). Th...

The density of `KBr` is `2.75 g cm^(-3)`. The length of the unit cell is `654` pm. Atomic mass of `K = 39, Br = 80`. Then what is true about the predicted nature of the solid?

A

Unit cell is fcc

B

Z=4

C

There are four constituents in the unit cell

D

There are 8 lines at the corners and 6 ions at the centres of the faces

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`(a, b, c, d), Z=(rhoxxa^(3)xx10^(-30)xxN_(0))/M`
`=(2.75xx(654)^(3)xx10^(-30)xx6.022xx10^(23))/((39+80)=199)=4`
It has 4 formula units per unit cell
The other two options are also correct
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