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Edge length of M^(+)X^(-) (fcc structure) is 7.2^(@)A. Assuming M^(+)-X^(-) contact along the cell edge, radius of X(-) ion is (r_(M+)=1.6^(@)A):

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Answer Text

`2.0^(@)A``5.6.^(@)A``2.8.^(@)A``3.8.^(@)A`

Answer :
1
Solution :
Edge length `(a)=2(r_(c)+r_(a))` <br> `2r_(a)=a-2r_(c),r_(a)=(a-2r_(c))/(2)`

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