Multiple choice

At constant temperature $ N_2 $ gas of 200 cm at 720 mm pressure and $ O_2 $ gas of 400 $ cm^3 $ at 750 mm pressure. These are mixed in 1 ltr capacity flask, than what will be the final pressure.

  1. 111 mm

  2. 222 mm

  3. 333 mm

  4. 444 mm
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D Correct answer
Explanation

At constant temperature, each gas contributes pressure proportional to its volume-pressure product divided by the final volume. The final pressure is (200 x 720 + 400 x 750)/1000 = 444 mm.

AI explanation

Using Boyle's law, the final partial pressure of nitrogen is (200 times 720) divided by 1000, which equals 144 mm, and the final partial pressure of oxygen is (400 times 750) divided by 1000, which equals 300 mm. Adding these two partial pressures together yields a total final pressure of 444 mm.

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