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Question

CsCl crystallizes in a cubic lattice that has a Cl at each corner and Cs+ at the centre of the unit cell. If (rCs+)=1.69oA and (rCl)=1.81oA, what is the value of edge length a of the cube?

A
4.04
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B
3.50
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C
3.03
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D
1.95
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Solution

The correct option is B 4.04
In CsCl type of crystal atoms touch along the body diagonal

3 a=2(r++r)

a=2×(1.69+1.81)3=4.04×1010 m

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