Pressure of $1 \ g$ ideal gas $X$ at $300 \ K$ is $2 \ atm$. When $2 \ g$ of another gas $Y$ is introduced in the same vessel at the same temperature,the total pressure becomes $3 \ atm$. The correct relationship between molar masses of $X$ and $Y$ is:
- A$M_Y = 2M_X$
- B$M_Y = 4M_X$
- C$M_X = 4M_Y$
- D$M_X = 5M_Y$
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