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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amongst He , Ne , Ar and Kr ; 1 g of activated charcoal adsorbs more of Kr . Reason R: The critical volume V c ( cm 3 mol – 1 ) and critical pressure P c (atm) is highest for Krypton but the compressibility factor at critical point Z c is lowest for Krypton. In the light of the above statements, ch

Options

  1. AA is true but R is false
  2. BA is false but R is true
  3. CBoth A and R are true but R is NOT the correct explanation of A
  4. DBoth A and R are true and R is the correct explanation A

Correct answer

A. A is true but R is false

Step-by-step solution

Kr has a maximum molecular weight, so it has more Van der Waal forces. So critical temperature is high and gas having more critical temperature is more adsorbed on activated charcoal. Hence, assertion is correct. The critical volume and critical pressure is highest for krypton but the compressibility factor at critical point is lowest at krypton. This reason is incorrect because Z c = 3 8 is same for all real gases.

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