1.

In an ionic solid `r_(c)=1.6Å` and `r_(a)=1.86Å`. Find edge length of cubic unit cell is `Å`

Answer» Correct Answer - 4
`(r_(c))/(r_(a))=0.858`
From above ratio it is clear that cation occupy cubic void in simple cubic unit cell, hence
`sqrt(3)a=2(r_(c)+r_(a))`
`a=4`


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