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NEET 2011

Exam: NEET
Year: 2011
Subject: Chemistry
Chapter: States of Matter

NEET 2011 · Chemistry · States of Matter

Two gases A and B having the same volume diffuse through a porous...

Two gases

A

and

B

having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of

A

is

49 \mathrm{u}

. Molecular mass of

B

will be

Options

A $12.25 \mathrm{u}$
B $6.50 \mathrm{u}$
C $25.00 \mathrm{u}$
D $50.00 \mathrm{u}$

Correct answer

A. $12.25 \mathrm{u}$

Step-by-step solution

\frac{r_A}{r_B}=\sqrt{\frac{M_B}{M_A}}

or

\frac{V_A}{t_A} \times \frac{t_B}{V_B}=\sqrt{\frac{M_B}{M_A}}

or

\quad \frac{10}{20}=\sqrt{\frac{M_B}{49}}

or

\quad \frac{1}{4}=\frac{M_B}{49}\therefore \quad M_B=\frac{49}{4}=12.25 \mathrm{u}

.

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