JEE Main Chemistry question
Not in JEE Main or NEET syllabus
Give the total score of the correct statements of the following:
| | Statement | Score | |---|---|---| | a. | First two nearest neighbour distances for sc lattice are, respectively, and | 4 | | b. | First two nearest neighbour distances for bcc lattice are, respectively, and | 3 | | c. | In ZnS (wurtzite), ions occupy the lattice point while in ZnS (zinc blende), ions occupy alternate tetrahedral voids | 2 | | d. | In point defects, the volume and geometry of the crystal do not change | 1 |
Solution
(a) is true: in a simple cubic lattice, the nearest neighbour lies at distance (along an edge) and the next-nearest at (along a face diagonal). (b) is true: in a bcc lattice, the nearest neighbour lies at (half the body diagonal) and the next-nearest at (along an edge). (c) is
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