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Question

A solid AB has NaCl structure. If radius of A+ is 100 pm. What is the radius of B ion?

A
120 pm
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B
136 to 241.6 pm
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C
280 pm
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D
Unpredictable
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Solution

The correct option is B 136 to 241.6 pm
For NaCl type compounds (Rock Salt)
r+r[0.414, 0.732]
Given, r+=100 pm
r+r=0.414.r=241.5
r+r=0.732r=136.6 pm
r[136.6 pm, 241.6 pm]
So radius of Y lies between 136.6 to 241.6 pm

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