(A) : At critical temperature liquid passes into gaseous state imperceptibly and continuously.
(R) : The density of liquid and gaseous phase is equal at critical temperature.

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Both (A) and (R) are correct and (R) is the correct explanation of (A)

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

At the critical temperature, the properties of a substance change dramatically as it passes from the liquid state to the gaseous state.
This is because the critical temperature represents the point at which the density of the liquid phase becomes equal to the density of the gaseous phase.
At this temperature, the intermolecular forces between the molecules in the liquid phase are no longer strong enough to hold the molecules together, and the substance begins to exhibit gas-like behavior.
As the temperature is increased above the critical temperature, the substance becomes increasingly gas-like, and the liquid phase gradually disappears.
As the substance passes from the liquid to the gaseous state at the critical temperature, it does so imperceptibly and continuously.
This is because there is no sharp boundary between the liquid and gaseous phases, and the properties of the substance change gradually as the temperature is increased.
So, both (A) and (R) are correct and (R) is the correct explanation of (A).

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