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The edge length of a face-centred cubic unit cell is `508 pm`. If the radius of the cation is `110 pm` the radius of the anion isA. 288 pmB. 398 pmC. 154 pmD. 618 pm |
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Answer» Correct Answer - C For centred unit cell, `2(r^(+)+r^(-))=a` `r^(+)-"radii of cation"` `r^(-)="radii of anion"` `2(1000+r^(-))=508` `100+r^(-)=(508)/(2)` `r^(-)=(508)/(2)-100` `=254-100=154" pm"` |
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