Q.

An ionic compound AB has ZnS type of structure if the radius of A+ is 22.5 pm, then the ideal radius of  B- is

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a

54.35 pm

b

100 pm

c

145.16 pm

d

None

answer is B.

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Detailed Solution

Since ionic compound AB has ZnS type of structure with co-ordination number 4;4.F or co-ordination number 4 the radius ratio should range between 0.22 to 0.41.radius of cationradius of anion=0.225r+r-=0.22522.5r-=0.225Hence, r-=100pm
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An ionic compound AB has ZnS type of structure if the radius of A+ is 22.5 pm, then the ideal radius of  B- is