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Standard VIII
Physics
Thermal Expansion of Solids
38. Assertion...
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38. Assertion - liquid molecules have greater potential energy at melting point Reason- intermolecular spacing between molecules increases at melting point
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Assertion :Liquid molecule have greater potential energy at the melting point Reason: Intermolecular spacing between molecules increases at melting point
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Assertion :On heating a substance to its melting point, inter-particle space increases. Reason: When a substance is heated, the kinetic energy of the particles(molecules/atoms) increases, due to which they push each other farther than their mean position.
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Assertion :Boiling and melting points of amides are higher than corresponding acids. Reason: It is due to strong intermolecular hydrogen bonding in their molecules.
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Assertion :Viscosity of liquids decreases as the temperature rises. Reason: At high temperature, molecules have high kinetic energy and can overcome the intermolecular forces to flow faster.
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Assertion :Ionic compounds have high melting and boiling points. Reason: The inter-ionic energy is high.
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