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171. Explain the following with suitable examples:
Ferrimagnetism

Ferrimagnetism:

This effect is observed when the magnetic moments of the domains in the substance are aligned in parallel and anti–parallel directions in unequal numbers. Ferrimagnetic substances are weakly attracted by magnetic field as compared to ferromagnetic substances. Magnetite like Fe₃O₄ and ferrites like MgFe₂O₄ and ZnFe₂O₄ are examples

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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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