Question

An alloy has usually less electrical conductivity and melting point than the main constituents why,?​

Answer 1

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We know that the electrical conductivity of a metal is because of mobile electrons in the electron sea. The presence of some other metal atoms of obstructs the movement of the electrons. As a result, the electrical conductivity of the alloy decreases. Similarly, the melting point of the alloy is also less than the main constituent metal because impurities always lower the melting point of a substance.