Multiple choice

At $740\space mm$ pressure in a closed vessel. No. of oxygen and hydrogen molecule is same, If oxygen is removed from system than pressure become :

  1. Half of $740\space mm$

  2. Unchanged
  3. $\displaystyle\frac{1}{9}th$ of $740\space mm$
  4. Double than $740\space mm$
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A Correct answer
Explanation

According to Dalton's Law of Partial Pressures, the total pressure is the sum of partial pressures. If the number of molecules is equal, the partial pressures are equal (740/2 = 370 mm each). Removing oxygen leaves only hydrogen, so the pressure becomes 370 mm, which is half of 740 mm.

AI explanation

According to Dalton's law of partial pressures, the total pressure of a gas mixture is the sum of the partial pressures of its individual components. Since the mixture initially contains an equal number of oxygen and hydrogen molecules, each gas contributes exactly half of the total pressure of 740 mm. Removing the oxygen eliminates its partial pressure of 370 mm, leaving only the hydrogen. The final pressure becomes half of 740 mm.

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