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31. Thallium chloride exists in Cs CI type lattice. What are the co-ordination number of TI and Cl^– ions?

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High pressure increases the co-ordination number from 6:6 to 8:8.

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33. In a crystal of zinc sulphide, zinc occupies tetrahedral voids. What is the coordination number of zinc?

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34. Why is potassium chloride sometimes violet instead of pure white?

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35. When high temperature is given to ferromagnetic substance what effect can be obtain ?

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36. For hcp crystal structure of an element What is the maximum possible coordination number ?

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37. How many atoms can be assigned to its unit cell if an element forms (i) a body centred cubic cell and (ii) a face centred cubic cell?

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38. How many Ca⁺ ions occupy second nearest neighbour locations to a central Cs⁺ ion in caesium chloride crystal?

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39. How many Na⁺ ions occupy second nearest neighbour locations of a Na⁺ ion in the structure of sodium chloride crystals?

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40. Why FeO is non-stoichiometric with the formula Fe_0.95 O explain?

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