Give the correct order of initials T (true) or F (false) for the following statements.I. In an anti-

Question

Give the correct order of initials T (true) or F (false) for the following statements.

I. In an anti-fluorite structure, anions form FCC and cations occupy all the tetrahedral voids.

II. If the radius of cation and anion is 20 and 95 pm, then the coordination number of cation in the crystal is 4.

III. An atom or ion is transferred from a lattice site to an interstitial position in Frenkel defect.

IV. The density of crystal always increases due to substitutional impurity defect.

Accepted Answer

$\left( 	ext{II} ight)\frac{r^{+}}{r^{-}} = \frac{20}{95} = 0.21(0.155 - 0.225) \Rightarrow C.N. = 3$

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