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The Solid State

Short Answer Type

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.

In covalent crystals, the shared pair of electrons give rise to very strong forces between them, therefore covalent solids like diamond and silicon carbide are quite hard and difficult to break and show very high melting points.

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