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$O_{2}$ gas is placed in a 4 litre container contaming 3 L of liquid water as shown and total pressure exerted by gases is 720 mm Hg. What will be the pressure of $O_{2} (g)$ if given container is attached to a empty container of 3 litre at same temperature? Given: $[V.P. of H_{2} O at 27^{\circ} C = 20 mm of Hg]$

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175 mm of Hg

350 mm of Hg

200 mm of Hg

800 mm of Hg

answer is A.

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Detailed Solution

Here, given have;

$\begin{array}{l} P_{T} = P_{O_{2}} + H_{2} O \\ 720 = P_{O_{2}} + 20 \\ \Rightarrow P_{O_{2}} = 700 \\ V ⟶ 4 V \\ P ⟶ \frac{1}{4} = \frac{700}{4} = \frac{350}{2} = 175 \\ \Rightarrow 175 mm of Hg \end{array}$

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