JEE Main levelSingle correct optionDifficulty 2 of 3sc017
For a Langmuir adsorption, the pressure needed to reach 90% coverage is how many times the pressure needed to reach 50% coverage at the same temperature?
A1.8
B9
C3
D90
Answer: B
From θ=Kp/(1+Kp), p=θ/[K(1−θ)]. So p0.9/p0.5=[0.9/0.1]/[0.5/0.5]=9. The ratio 1.8 is simply 0.9/0.5.