A gas cylinder contains 10 L of O₂ at 2 atm. What pressure is needed to compress it to 5 L at constant temperature?
Q1. A gas cylinder contains 10 L of O₂ at 2 atm. What pressure is needed to compress it to 5 L at constant temperature?
Answer: 4 atm
Explanation: P₁V₁ = P₂V₂ → 2×10 = P×5 → P = 4 atm. Option B ignores volume change.