$(a)\;\large\frac{3}{4}\qquad(b)\;\large\frac{1}{4}\qquad(c)\;\large\frac{1}{2}\qquad(d)\;\large\frac{1}{8}$

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On heating a gas in a open container (P = constant, V = Constant) some moles of gas goes out.

Thus,

$n_1T_1 = n_2T_2$

$n_1\times300 = n_2\times400$

$n_2 = \large\frac{3n_1}{4}$

$\therefore$ Fraction of moles of gas left

$\Rightarrow \large\frac{n_2}{n_1} = \large\frac{3n_2}{4n_1} =\large\frac{3}{4}$

Hence answer is (a)

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