1.

Which of the following combination, of compounds/elements and its packing fraction is true? Assume all cations or anions are ideally fitted in the voids without any distortion in lattice.

Answer»

`Na_(2)O, phi=(pi)/(3sqrt(2)) {1+2xx(0.225)^(3)}`
`Cr_(2)O_(3),phi=(pi)/(3sqrt(2)){1+ 2/3xx(0.414)^(3)}`
`Fe_(2), O_(3), phi=(pi)/(3sqrt(2)){1+(0.225)^(3)}`
Diamond, `phi=(pi)/(3sqrt(2)){1+(0.414)^(3)}`

Solution :`Fe_(2)O_(3), phi=(pi)/(3sqrt(2)){1+2/3(0.414)^(3)}`
Diamond `phi=8xx(4pir^(3))/(3xx(2sqrt(2)R)^(3))`


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