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1. The molecules are held together by intermolecular force of attraction. More the force the fusion takes after some time only that means the melting point is high. So molecules with greater molecular forces have high melting point and less molecular forces have low melting point.
2. when it is given to change the physical state
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Explanation:a.the more the intermolecular force of attraction the more the melting point bcoz particles are attracted with a strong force and large amount of heat is required to overcome the force.
B. During change in state the heat provided is used to overcome the force of attraction or bonds between atoms thus there is no net increase in temperature.
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