A solid compound(XY) has NaCl type structure. If the redius of carbon is 120pm, the edge length of XY will be-
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In Rock salt structure (NaCl) the relationship between r
+
( radius of cation) , r
−
( radius of anion) & 'a' ( edge length is ) :
r
+
+ r
−
= a / 2
80 + r
−
= 500 / 2
r
−
= 170 pm .
Correct option is D
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