Question: 1. Which point defect lowers the density of an ionic crystal? 2. Name one compound in which both Frenkel and Schottky defects are present together.

1. Which point defect lowers the density of an ionic crystal?

2. Name one compound in which both Frenkel and Schottky defects are present together.

3. Why does ZnO exhibit enhanced electrical conductivity on heating?

4. Zinc oxide is white but it turns yellow on heating. Why?

5. If AgI crystallises in a zinc blende structure with I^- ions forming the lattice, then what fraction of tetrahedral voids are occupied by Ag⁺ ions?

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