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The face diagonal length of fcc cubic ce...

The face diagonal length of fcc cubic cell of `NaCl` type ionic crystal is `600sqrt2` pm , if the radius of the cation is 100 pm the radius of anion becomes `x xx 10^(2)` pm, then x is ...... 

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The correct Answer is:
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`sqrt2a=4r^(-)=600sqrt2, a =600, a=2r^(+)+2r^(-), 600=2r^(-)+200, r^(-)=200=2xx10^(2)`
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