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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

It has `4 K^+` and `4 Br^-` ions per unit cell

B

It is face-centred

C

It has rock-salt type structure

D

It can have Schottky defects

Text Solution

Verified by Experts

The correct Answer is:
A,B,C,D
`Z=(rhoxxa^3xx10^(-30)xxN_0)/M`
`=(2.75xx(654)^3xx10^(-30)xx6.02xx10^23)/119=4`
Thus, it has 4 formula units per unit cell.
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