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Q.

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What is represented by straight lines QR and ST in the graph ?

 

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a

QR represents latent heat of fusion, while ST represents latent heat of vaporization

b

Temperature remains same during the change of state 

c

At QR, matter exists in both solid and liquid states, while at ST matter exists in both liquid and gaseous states

d

All of these

answer is D.

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Detailed Solution

At QR (273 K), inter conversion of solid to liquid takes place. So, matter exists in both solid and liquid states and it represents latent heat of fusion. At ST (373 K), inter conversion of liquid to gas takes place so, matter exists in both liquid and gases states and it represents latent heat of vaporization. Temperature remains constant at QR and ST.

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