JEE Main Chemistry question
Not in JEE Main or NEET syllabus
Given the total score of the correct statements of the following:
| | Statement | Score | |---|---|---| | a. | In an antifluorite structure, cations are present in all tetrahedral voids | 1 | | b. | If the radius of cation is 0.35 pm and that of anion is 0.95 pm, then the coordination number of the crystal is 4 | 2 | | c. | An atom or ion is transferred from a lattice site to an interstitial position in Frenkel defect | 3 | | d. | The density of a crystal always decreases in point defects | 4 |
Solution
(a) is true, since in the antifluorite structure the anions form a ccp lattice while the cations occupy all of the tetrahedral voids. (b) is true, since the radius ratio lies in the 0.225–0.414 range, which corresponds to a coordination number of
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