2gm of hydrogen is present in a closed vessel at S.T.P. If the same quantity of another gas ‘X’ when introduced into the vessel the pressure becomes 1.5 atm. The gas ‘X’ would be

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${SO}_{2}$

$O_{2}$

${CH}_{4}$

answer is C.

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Detailed Solution

Pressure due to $H_{2} = 1 atm$

$\begin{array}{l} Pressure due to X = 1.5 - 1 = 0.5 atm \Rightarrow \frac{1}{2} mole \\ \frac{1}{2} mole weights 2 gm \Rightarrow 1 mole weights 4 gm \\ \Rightarrow He \end{array}$

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