NTA Abhyas JEE Main2020ChemistrySolid StatePractice

CsCl crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct?

Options

Ar Cs + + r Cl - = 3 a
Br Cs + + r Cl - = 3 a 2
Cr Cs + + r Cl - = 3 2 a
Dr Cs + + r Cl - = 3 a

Correct answer

C. r Cs + + r Cl - = 3 2 a

Step-by-step solution

8 chloride ions at 8 corners Cs + cation at body centre along body diagonal there will be one Cs + cation and 2 Cl − ions at ends of body diagonal. 2 r Cs + + 2 r Cl - = 3 a a is edge length

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