7091. A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C. September 7, 2025 by Admin 21.7 20 27.3 18.7 ✅ The correct answer is option D.