A) A and R both are correct and R is the correct explanation of A.
B) A and R both are correct but R is not the correct explanation of A.
C) A is correct but R is incorrect.
D) A is incorrect while R is correct.
Correct Answer: A
Solution :
At critical temperature, it is not possible to state whether the substance is in the gaseous form or in the liquid form. In fact, both the states become indistinguishable at the critical point. The surface of separation between liquid and gas disappears. At this point the various physical properties such as density, refractive index etc have identical values for both the states.
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