Study the following graph and based on that answer the questions with suitable reason. The graph represents the various stages inveolved in step wise change of ice to steam. (a) Identify the stages associated with increase in temperature. Give reason. (b) In which stages, the temperature is constant? Why?

Study the following graph and based on that answer the questions with

1.	Study the following graph and based on that answer the questions with suitable reason. The graph represents the various stages inveolved in step wise change of ice to steam. (a) Identify the stages associated with increase in temperature. Give reason. (b) In which stages, the temperature is constant? Why?
Answer» (a) In the graph, part 1 to 2,3 to 4 and 5 to 6 show heating of solid, liquid and gas respectively which increases kinetic energy and hence there is rise in temperature. (b) the parts, 2 to 3 and 4 to 5 represent melting of solid and boiling of liquid. At these points the heat energy supplied is utilized for decreasing the intermolecular force of attraction and hence there is no change in temperature

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