KBr crystallizes in NaCl type of unit cell. K + radius = 1.…

Chemistry Solid State General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 11, 2026

KBr crystallizes in NaCl type of unit cell. K + radius = 1.33Å, Br¯ radius = 1.95 Å

How many K + ions and how many Br¯ ions are in each unit cell?

Assuming the additivity of ionic radii, what is a ?

Calculate the density of a perfect KBr crystal.

What minimum value of r + /r – is needed to prevent anion-anion contact in this structure.

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

K + ion = 4 & Br¯ ion = 4

6.56 Å 2.80 g/cm 3 0.414

Sol. KBr is NaCl type, so no. of K + & Br – are 4 each.

a = = 2(1.33 + 1.95) = 6.56 Å

density = = 2.80 g/cm 3

for octahedral voids, = 0.414

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