Q.

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a

Co-ordination no. of Cs+ and Cl- are 8, 8 in CsCl crystal

b

If radius ratio rc/ra<0.225then shape of compound must be linear

c

If radius ratio rc/ralies between 0.414 to 0.732 then shape of ionic compound may square planar Ex.PtCl42−

d

If radius ratio is less than 0.155 then shape of compound is linear

answer is A.

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Detailed Solution

.CsCl has a body-centered cubic structure in which Cl− form simple cubic unit cell and Cs+ ion will be present at the body-centered void.In BCC void the radius ratio has range 0.732 to 0.999∴ limiting radius ratio =0.732
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