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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.

The strength of metallic bond depends upon the numbr of valence electrons of the metal atom and the magnitude of forces binding these electrons to the nuclei. Thus the strength of metallic bond in different metals may be weak or strong, hence their nature (soft or hard) and their melting points may be different.

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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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Fill In the Blanks

179. A liquid which is permanently supercooled is frequently called a _____

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180. The smallest portion of a crystal which has the structure characteristic of space lattice is called the__________.

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