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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

Antifluorite structure:
The antifluorite structure is the opposite arrangment with anion in FCC array with coordination number 8 and cation in the tetrahedral holes with coordination number 4. example of the antifluorite structure are K₂O, LiO, Na₂O and K₂S.

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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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