Which one of the following substances does not have a melting point? (1) Bromine (2) Sodium chloride (3) Mercury (4) Glass

Which one of the following substances does not have a melting point? (1) Bromine (2) Sodium chloride (3) Mercury (4) Glass
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(3) Mercury Explanation: The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
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