Give the correct order of initials T (true) or F (false) for following statements: I. In an anti-fluorite structure, anions form FCC and cations occupy all the tetrahedral voids. II. If the radius of

Question

Give the correct order of initials T (true) or F (false) for 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. Density of crystal always increases due to substitutional impurity defect.

Prashant Kotian · Accepted Answer

Correct answer: D. I is True. II is False (, which means CN=3, not 4). III is True. IV is False (density decreases if the substituting impurity is lighter). Sequence is T F T F. Therefore, correct answer is D.

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