Q. Dalton's law of partial pressures states that:

डाल्टन का आंशिक दबाव का नियम कहता है कि:

A
Total pressure equals the sum of partial pressures
कुल दबाव आंशिक दबाव के योग के बराबर होता है
B
Partial pressure is proportional to temperature
आंशिक दबाव तापमान के समानुपाती होता है
C
Total pressure equals average of partial pressures
कुल दबाव आंशिक दबाव के औसत के बराबर होता है
D
None of these
इनमें से कोई नहीं

Explanation

Dalton's Law states that in a mixture of non-reacting gases, the total pressure equals the sum of the partial pressures of individual gases.

Mathematical expression: P_total = P₁ + P₂ + P₃ + ... + Pₙ

Key points:

  • Each gas behaves independently
  • Partial pressure = mole fraction × total pressure
  • P₁ = (n₁/n_total) × P_total
  • This law applies to ideal gas mixtures

Example: Air contains ~78% N₂ and ~21% O₂

  • If total pressure = 1 atm
  • P_N₂ = 0.78 atm, P_O₂ = 0.21 atm
  • P_total = 0.78 + 0.21 = 0.99 atm (≈1 atm)

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Atomic Structure & Bonding Chemical Equilibrium General Chemistry Chemical Kinetics Gaseous & Liquid States

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