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100 ml of O 2 g effuse from a porous container in 100 sec . 75 ml of unknown gas effuses under the same conditions of temperature and pressure in 150 sec . Calculate vapour density of unknown gas?

Options

  1. A16
  2. B32
  3. C64
  4. D128

Correct answer

C. 64

Step-by-step solution

r o 2 r u n k n o w n = v 1 t 1 v 2 t 2 = M u n k n o w n M o 2 ⇒   100   ×   150 100   ×   75   =   M unknown 32 ⇒ M unknown = 128 ∴   V .D . = 128 2 = 64

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