A) 2
B) 4
C) 8
D) 16
Correct Answer: A
Solution :
According to rate of effusion or diffusion \[\frac{{{r}_{{{o}_{2}}}}}{{{r}_{x}}}=\sqrt{\frac{{{M}_{x}}}{{{M}_{{{o}_{2}}}}}}\] \[\left[ {{r}_{x}}=4{{r}_{{{o}_{2}}}} \right]\] Molecular mass of oxygen = 32 \[\frac{{{r}_{{{o}_{2}}}}}{4{{r}_{{{o}_{2}}}}}=\sqrt{\frac{{{M}_{x}}}{32}}\] \[{{M}_{x}}=2\]
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