States of Matter - Result Question 7

####7. A certain gas takes three times as long to effuse out as helium. Its molecular mass will be :

(a) 27u

(b) 36u

(c) 64u

(d) 9u

[2012 M]

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Solution:

  1. (b) According to Graham’s law of diffusion

r1d1Mr1r2=M2M1

3r1r1=M249=M24

M2=36u



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