171.Explain the following with suitable examples: Ferrimagnetism
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172.Explain the following with suitable examples: Piezoelectric effect (or pressure electricity)
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173.Explain the following with suitable examples: Antifluorite structure
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174.Give reasons for the following: Molecular solids are generally soft and easily compressible.
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175.Give reasons for the following: The energy required to vapourise one mole of copper is smaller than that of energy required to vapourise one mole of diamond.
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176.Give reasons for the following: All metals have metallic bonds but some metals are soft and having low melting points and some are hard and having high melting points.
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177.Give reasons for the following: Covalent crystals like diamond and silicon carbide are quite hard and difficult to break.
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178.Give reasons for the following: Ionic solids, inspite of being made up of ions, do not conduct electricity.
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