NEET 2023 Phase 2 · PhysicsIdeal gasPrevious Year Question
A container of volume 200 cm³ contains 0.2 mole of hydrogen gas and 0.3 mole of argon gas. The pressure of the system at temperature 200 K (R = 8.3 J K⁻¹ mol⁻¹) will be:
Answer: (B) 4.15 × 10⁶ Pa. Correct Answer (B): 4.15 × 10⁶ Pa By Dalton's law each ideal gas contributes its own partial pressure, and the total pressure depends only on the total number of moles.
- A.4.15 × 10⁵ Pa
- B.4.15 × 10⁶ Pa✓
- C.6.15 × 10⁵ Pa
- D.6.15 × 10⁴ Pa
Correct Answer
(B) 4.15 × 10⁶ Pa
Solution & Explanation
Correct Answer (B): 4.15 × 10⁶ Pa By Dalton's law each ideal gas contributes its own partial pressure, and the total pressure depends only on the total number of moles. With n = 0.2 + 0.3 = 0.5 mol, apply PV = nRT using V = 200 cm³ = 2 × 10⁻⁴ m³ and T = 200 K. The small volume drives the pressure into the 10⁶ Pa range.
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