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AIIMS2017ChemistryStates of Matter

The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A . What will be the ratio of the pressures acting on B and A ?

Options

  1. A1 4
  2. B7 8
  3. C2 5
  4. D1 6

Correct answer

D. 1 6

Step-by-step solution

d p = M R T Let density of gas B be d . density of gas A=3 d and let molecular weight of A be M . molecular weight of B=2 M Since, R is gas constant and T is same for both gases, so aligned & p_A= d_A R T M_A and p_B= d_B R T M_B & p_B p_A = d_B d_A M_A M_B = d 3 d M 2 M = 1 6 aligned

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