(A) : Critical temperature is the temperature at which the real gas exhibits ideal behaviour for considerable range of pressure.
(R) : At critical point the densities of a substance in gaseous and liquid states are different

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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 C.

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Detailed Solution

Temperature at which the real gas exhibits ideal behaviour for considerable range of pressure is known as Boyle's temperature $T_{b} = a / bR$ , where a and b are van der Waals' constants.
Critical temperature is the temperalure above which, the gas cannot be liquefied, how so ever high pressure may be applied : T_c = 8a/27Rb.
At the critical point, the densities of substance in gaseous and liquid state are same.

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