Q.39. A 0.5 d m 3 flask contains gas A and 1 d m 3 flask contains gas B at the same temperature. If density of A is twice that of B and the molar mass of A is half of B, then the ratio of pressure exerted by gases is
(a) P A / P B = 2
(b) P A / P B = 1
(c) P A / P B = 4
(d) P A / P B = 3

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