Give the correct order of initials T (true) o | vedclass

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(D) $I.$ In an anti-fluorite structure,anions (e.g.,$O^{2-}$) form an $FCC$ lattice and cations (e.g.,$Na^+$) occupy all tetrahedral voids. This state

Vedclass · Accepted Answer

$TFTF$

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(D) $I.$ In an anti-fluorite structure,anions (e.g.,$O^{2-}$) form an $FCC$ lattice and cations (e.g.,$Na^+$) occupy all tetrahedral voids. This statement is $True$ $(T)$.$II.$ The radius ratio $= \frac{r_{cation}}{r_{anion}} = \frac{0.2}{0.95} \approx 0.21$. Since $0.155 $III.$ In a Frenkel defect,an ion (usually the smaller cation) leaves its lattice site and occupies an interstitial site. This statement is $True$ $(T)$.$IV.$ Substitutional impurity defects can either increase or decrease the density of a crystal depending on whether the substituting atom is heavier or lighter than the host atom. The statement that it "always increases" is $False$ $(F)$.Thus,the correct order is $TFTF$,which corresponds to option $D$.

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