Question

# A binary solid $$(A^{+}B^{-})$$ has a rock salt structure. If the edge length is $$400$$ pm and radius of cation is $$75$$ pm, the radius of anion is:

A
100 pm
B
125 pm
C
250 pm
D
325 pm

Solution

## The correct option is B $$125$$ pmEdge length in a rock salt structure $$\Rightarrow a = 2\ \left( { r }_{ + }+{ r }_{ - } \right)$$  $$2(75 + r_{-})=400\ pm \Rightarrow r_-=125\ pm$$Chemistry

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