Liquid oxygen at 50 K is heated to 300 K at a | vedclass

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(D) When a substance is heated at a constant rate,its temperature increases until it reaches its boiling point. During the phase change (boiling),the

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(D) When a substance is heated at a constant rate,its temperature increases until it reaches its boiling point. During the phase change (boiling),the temperature remains constant as the heat supplied is used to overcome the intermolecular forces (latent heat of vaporization). After the substance has completely turned into gas,the temperature increases again. Therefore,the temperature-time graph shows a linear increase,followed by a horizontal plateau during the phase change,and then another linear increase. This behavior is correctly represented by graph $D$.

Liquid oxygen at $50\ K$ is heated to $300\ K$ at a constant pressure of $1\ atm$. The rate of heating is constant. Which of the following graphs represents the variation of temperature with time?

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