Question -Assertion (A): Water boiling in an open vessel at a fixed temperature is an example of physical equilibrium. Reason (R): Temperature does not change during the process of boiling. Which of the following is correct?
Options:
A .  Both A & R are correct and R is correct explanation of A.
B .  Both A & R are correct but R is not a correct explanation of A.
C .  A is true but R is false
D .  A is false but R is true.
Answer: Option D : D Equilibrium is possible only in a closed vessel. Hence A is false. Boiling occurs at a constant temperature at a given pressure. Hence R is true.
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