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If the distance between Nat and C ions in sodiumchloride crystal is Xpm, the length of the edge of the unit cell is

Answer»

4 X pm
 X74 pm
`X//2` pm
2Xpm

Solution :This distance between sodium and chloride ions - X pm The distance between two chloride ions =`sqrt(X^(2)+X^(2))=sqrt(2X^(2))=Xsqrt2`
`p_(CI^(-))=(Xsqrt2)/(2)`
In a face-centred cubic LATTICE, anions touch each other ALONG the face diagonal of the cube.
`a=(4r_(SIGMA))/sqrt(2)=(4Xsqrt2)/sqrt(2.2)=2X`


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