A) \[72\]
B) \[6\]
C) \[24\]
D) \[36\]
Correct Answer: A
Solution :
Given, \[\frac{^{r}{{H}_{2}}}{^{r}A}=6,{{M}_{{{H}_{2}}}}=2,{{M}_{A}}=?\] From Grahams law of diffusion, \[\frac{^{r}{{H}_{2}}}{^{r}A}=\sqrt{\frac{{{M}_{A}}}{{{M}_{{{H}_{2}}}}}}\] or \[6=\sqrt{\frac{{{M}_{A}}}{2}}\] or \[36=\frac{{{M}_{A}}}{2}\] \[\therefore \] \[{{M}_{A}}=72\]
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