$(a)\;333\;mL\qquad(b)\;30\;mL\qquad(c)\;33.3\;mL\qquad(d)\;40\;mL$

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Suppose at

$T = 27^{\large\circ}C = 300K$

$T_1 = 37^{\large\circ}C = 310K$

V = 1 litre

$V_1 = ?$

At constant pressure = $\large\frac{V}{T} = \large\frac{V_1}{T_1}$

$\Rightarrow \large\frac{1}{300} = \large\frac{V_1}{310}$

$\Rightarrow V_1 = \large\frac{310}{300}$

$\Rightarrow 1.0333 \; litre$

Since capacity of flask is 1 litre

Volume of air escaped out = 1.0333 - 1

$\Rightarrow$ 0.033 litre

$\Rightarrow$ 33.3 mL

Hence answer is (C)

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