Multiple choice

Same volume of hydrogen and oxygen at the same temperature and pressure are mixed together so that the volume of the mixture is same as the initial volume of the either gas If the initial pressure be $p$, then the pressure of the mixture will be:

  1. $4\ p$
  2. $2\ p$
  3. $p/2$
  4. $p/4$
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B Correct answer
Explanation

According to Dalton's Law of Partial Pressures, when two gases are mixed in the same volume at the same temperature, the total pressure is the sum of the partial pressures. Since each gas initially occupied the same volume V at pressure p, and now they occupy the same volume V together, each exerts pressure p. Total pressure = p + p = 2p.

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