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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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Q. Assertion :Liquid molecule have greater potential energy at the melting point Reason: Intermolecular spacing between molecules increases at melting point

Q. 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.

Q. Assertion :Boiling and melting points of amides are higher than corresponding acids. Reason: It is due to strong intermolecular hydrogen bonding in their molecules.

Q. 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.

Q. Assertion :Ionic compounds have high melting and boiling points. Reason: The inter-ionic energy is high.

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