At the melting point, the temperature remains ______________.

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Solution

Melting - The process in which a solid on heating changes into liquid is called melting or fusion.
At the melting point, the temperature remains constant.
The temperature of a substance remains constant at its melting point until all of the substance melts because the heat supplied is continuously used up in changing the state of the substance by overcoming the forces of attraction between the particles.
It is a physical change as no new substance is formed and the process can be easily reversed by changing the temperature.
Example - When ice is kept at room temperature or heated, it changes into water.
Thus, at the melting point, the temperature remains constant.

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Q. A fixed temperature at which a solid changes into a liquid is called melting point. True or false.

Assertion: At the melting point temperature, both the solid and liquid state of a substance coexist.
Reason: At the melting point temperature, the two states of a substance can be interchanged.

Q. The melting point of a substance is the constant temperature at which:

Melting and freezing point of a body occurs at same temperature.

Statement (A):The constant temperature at which a solid change into liquid state by absorbing heat energy is called melting point.

Statement (B): The constant temperature at which a liquid changes into gaseous state by absorbing heat energy is called point.

Statement (C): The melting and boiling points of a pure substance is always a constant and is a good measure of finding the purity of the substance.

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