Hydrogen diffuses 6 times faster than gas X. The molecular mass for X will be___.

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140

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144

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100

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Solution

The correct option is A
72

$\frac{r_{H_{2}}}{r_{x}} = \sqrt{\frac{M_{x}}{2}} \Rightarrow \frac{6}{1} = \sqrt{\frac{M_{x}}{2}}$

$M_{x} = 36 \times 2 = 72$

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