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Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

It is covalent or network solid.
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Ionic solids conduct electricity in liquid state but not in solid state. Explain.

Ionic solids do not conduct electric current in solid state because in the solid ionic compound, the ions are held together in fixed positons by strong electrostatic forces and cannot move freely.
Ionic solids conduct electricity in liquid state because the crystal structure is broken down and ions become free to move and conduct electricity.

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What type of solids are electrical conductors, malleable and ductile?


Metallic solids are electrical conductors, malleable and ductile.
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Give the significance of a 'lattice point'.

(i) Each point in a lattice is called lattice point or lattice side.
(ii) Each point in a crystal lattice represents one constituent particle which may be an atom, a molecule or an ion.
(iii) Every lattice point has identical surroundings except those which are on the surface or corner of a crystal.
(iv) If a line is drawn by joining two lattice points, it would pass through a series of similar points at regular intervals.
(v) Lattice points are joined by straight lines to bring out the geometry of the lattice. These lines do not represent chemical bond.

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Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.

Molecular solids: water, argon.
Ionic solids: potassium sulphate, zinc sulphate.
Metallic solids: tin, rubidium.
Covalent or network: benzene, urea, ammonia, graphite, silicon carbide.

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