The kinetic energy of molecules _____ when a solid melts. (increases/decreases)

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Solution

(1) Melting is a process in which a substance in solid state changes into liquid state at a particular temperature.
(2) When a solid melts by gaining energy the temperature of solid increases which increases the molecular motion resulting in an increase in kinetic energy as kinetic energy depends upon speed of the molecules.
Therefore, the kinetic energy of molecules increases when a solid melts.

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According to Maxwell, Boltzmann distribution of energy, ......... .
(a) the fraction of molecules with most probable kinetic energy decreases at higher temperatures
(b) the fraction of molecules with most probable kinetic energy increases at higher temperatures
(c) most probable kinetic energy increases at higher temperatures
(d) most probable kinetic energy decreases at higher temperatures

The kinetic energy of molecules ____________ when a solid melts.

Q. Statement I: Increasing the pressure on a confined sample of a gas will decrease its volume.
Statement II: Gas molecules move more slowly as their kinetic energy decreases.

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.

When a solid melts, there is

i) increase in enthalpy

ii) decrease in internal energy

iii) decrease in enthalpy

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