Answer:
During melting, the heat equal to latent heat of fusion
and during boiling, heat equal to latent heat of vaporisation is used to
overcome the inter particle force of attraction. Therefore, temperature remains
constant.
Fig. (a) represents
the change of temperature with time correctly. The temperature of water first decreases
up to zero degree celcius then remains constant for sometime (till the ice is
formed), then again starts decreasing.
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