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CsCl crystallizes in body centred structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be

a.  r  cs +    + r cl-    = 3a

b. r  cs +    + r cl-    = 3a/ 2

c. r  cs +    + r cl-    =  √3/2 a

d. r  cs +    + r cl-    = √3a

Ans. c

(6)

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