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Q.

M+X- crystallizes as FCC structure. Edge length is 3.2 A0. Radius of anion is 1.4 A° . Assuming M+-X-contact along the cell edge, radius of M+ ion is . The value of is x×10-1 A0. The value of ‘x’ is

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answer is 2.

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Detailed Solution

Given,

Edge length, a = 3.2 A°

Radius of anion, r=1.4A0

Radius of cation, r+=?

2r++r=3.2r++r=1.6r+=1.61.4r+=0.2A0r+=2x×101A0

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