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Question

The melting point of a substance is the constant temperature at which:
  1. solid starts melting.
  2. solid is completely changed into liquid.
  3. only liquid is present.
  4. both solid and liquid exist together.

A
only liquid is present.
B
solid starts melting.
C
solid is completely changed into liquid.
D
both solid and liquid exist together.
Solution
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The melting point of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point, the solid and liquid phase exist in equilibrium.

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