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Question

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

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

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