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NEET 2012
Exam
NEET
Year
2012
Subject
Chemistry
Chapter
States of Matter

NEET 2012 · Chemistry · States of Matter

A certain gas takes three times as long to effuse out as helium....

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

Options

  1. A27u27 \mathrm{u}
  2. B36u36 \mathrm{u}
  3. C64u64 \mathrm{u}
  4. D9u9 \mathrm{u}

Correct answer

B. 36u36 \mathrm{u}

Step-by-step solution

From Graham's diffusion law, r1r2=M2M1 or V1t1×t2V2=M2M1\begin{aligned} \frac{r_1}{r_2} & =\sqrt{\frac{M_2}{M_1}}\\ \text{ or } \quad\frac{V_1}{t_1} \times \frac{t_2}{V_2} & =\sqrt{\frac{M_2}{M_1}}\end{aligned}∵\because Volume is same, ∴31=M24\therefore \quad \frac{3}{1}=\sqrt{\frac{M_2}{4}} or 9=M24orM2=9×4=36u\quad 9=\frac{M_2}{4} or \quad M_2=9 \times 4=36 \mathrm{u}
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