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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Fill In the Blanks
The smallest portion of a crystal which has the structure characteristic of space lattice is called the__________.
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Explain the following with suitable examples: Antifluorite structure
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Fill In the Blanks
A liquid which is permanently supercooled is frequently called a _____
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Give reasons for the following: Covalent crystals like diamond and silicon carbide are quite hard and difficult to break.
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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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Explain the following with suitable examples: Piezoelectric effect (or pressure electricity)
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Give reasons for the following: Ionic solids, inspite of being made up of ions, do not conduct electricity.
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Give reasons for the following: Molecular solids are generally soft and easily compressible.
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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.
