At $27^{\circ} C$,a closed vessel contains a mixture of equal weights of helium (mol. wt. = $4$),methane (mol. wt. = $16$) and sulphur dioxide (mol. wt. = $64$). The pressure exerted by the mixture is $210 \ mm$. If the partial pressures of helium,methane and sulphur dioxide are $p_1, p_2$ and $p_3$ respectively,which one of the following is correct?
- A$p_3 > p_2 > p_1$
- B$p_1 > p_2 > p_3$
- C$p_1 > p_3 > p_2$
- D$p_2 > p_3 > p_1$
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