Question

A student heats a beaker containing ice and water. He measures the temperature of the content of
the beaker as a function of time. Which of the following fig. would correctly represent the
result? Justify your choice.

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Answer 1

Answer:

Graph (d) is the correct answer.

Explanation:

Latent heat of fusion or melting:

The amount of heat energy required to change 1kg of a solid into liquid at atmospheric pressure at its melting point is called the latent heat of fusion or melting.

Here, As the water and ice mixed in a jar, first the ice will melt and then only water will boil. So,till the ice melts the temperature will remain 0°C. And then gradually water will reach its boiling point and boil.

Graph (A):

In this graph, they given that the temperature is gradually increasing at the starting and remaining same at the end.So,it is false.

Graph (B):

In this graph, they given that the temperature is reducing on heating. So it is false.

Graph (C):

Here also they given as temperature is reducing on heating. So, this is also false.

Graph (D):

It is the correct one as it is related to the above statement. As the water and ice mixed in a jar, first the ice will melt and then only water will boil. So,till the ice melts the temperature will remain 0°C. And then gradually water will reach its boiling point and boil. So,it is true.