Surfactant A is said to have higher efficiency than B. What does it mean? A is more effective in reducing the surface tension at low concentrations A is less effective in achieving maximum surface tension reduction at CMC A is less effective in reducing the surface tension at low concentrations A is more effective in achieving maximum surface tension reduction at CMC Question 6 2 pts A minimum in the surface tension vs concentration plot of a surfactant is indicative of the presence of: Less surface active surfactant as an impurity Glycerol as an impurity Salt as an impurity Highly surface active molecule as an impurity