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A binary solid (A^(+)B^(-)) has a rock s...

A binary solid `(A^(+)B^(-))` has a rock salt structure .If the edge length is `300 p m` and radius of cation is 60 pm the radius of anion is

A

100 pm

B

125 pm

C

250 pm

D

90 pm

Text Solution

Verified by Experts

The correct Answer is:
B
`2r^(+)+2r^(-)=a=400"pm"`
`r^(-)=1//2(400-2xx75)`
`=1//2(400-150)=125"pm"`
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