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JEE Main20257 Apr 2025Morning ShiftChemistryStates of MatterActual

At the sea level, the dry air mass percentage composition is given as nitrogen gas : 70.0, oxygen gas : 27.0 and argon gas : 3.0. If total pressure is 1.15 atm , then calculate the ratio of followings respectively : (i) partial pressure of nitrogen gas to partial pressure of oxygen gas (ii) partial pressure of oxygen gas to partial pressure of argon gas (Given : Molar mass of N , O and Ar are 14, 16, and 40 ~g ~mol ⁻

Options

  1. A4.26,19.3
  2. B2.59,11.85
  3. C5.46,17.8
  4. D2.96,11.2

Correct answer

D. 2.96,11.2

Step-by-step solution

P _ N ₂ Po ₂ = x _ N ₂ P _ T x _ O ₂ P _ T = n _ N ₂ n _ O ₂ using Dalton's law of partial pressure aligned & = 70 / 28 27 / 32 =2.96 & P _ O ₂ P _ Ar = n _ O ₂ n _ Ar = 27 / 32 3 / 40 =11.25 aligned

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