Question

1)give reason:temperature of a liquid does not change when it boils.
2)The melting points of 3 solids X, Y ,Z are 314K,268K and 346K respectively. Arrange these in increasing order of their inter particle force of attraction .What is the basis of arrangement ?

Answer 1

This is because of latent heat of vaporization.The heat supplied to liquid is used up in changing the state of matter and thus the temperature does not change and the heat remains hidden from the thermometer.

if the melting point of a soild is high then its the inter particle force of attraction will be also high
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melting point is directly proportional to force of attraction
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increasing order
Y<X<Z