Question

1 mole of chlorine and 1 mole of hydrogen were taken in a 10 L evacuated flask along with a little charcoal. The flask was then irradiated with light until the reaction was complete. Subsequently, 5L of water was introduced into the flask and the flask was cooled to ${27}^{o}C$. The pressure exerted by the system is approximately equal to:

[Aqueous tension at ${27}^{o}C=26mm$]

• A. 98.5 mm
• B. 26 mm
• C. 52 mm
• D. 76 mm

Answer 1

The correct option is B 26 mm

Since, $HCl$ is highly soluble in water, no gas is present in the flask. The pressure exerted is by water vapour which is equal to aqueous tension i.e., 26 mm at ${27}^{o}C$.