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A binary solid AB has rock salt structur...

A binary solid AB has rock salt structure. If the edge length is 400 pm and radius of cation is 75 pm then the radius of anion would be

A

100 pm

B

125 pm

C

250 pm

D

325 pm

Text Solution

Verified by Experts

The correct Answer is:
B
`2r^(+)+2r^(-)=400 or r^(+)+r^(-)=200`
`or r^(-)=200-r^(+)`
`or r^(-)=200-75=125`.
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