Passage V
Students studied the photodecomposition (breakdown by light) of p-nitrophenol (a toxic pollutant) in wastewater. They measured the concentration of p-nitrophenol (in parts per million, ppm) in wastewater samples during exposure to various lighting conditions. Titanium dioxide (TiO2) and/or hydrogen peroxide (H2O2) were added to some samples at the start of exposure (time = 0 min). TiO2 and H2O2 speed up some photodecomposition reactions. The results of 3 sets of experiments are shown in Figures 1-3.
24. According to Figure 1, for the sample that contained TiO2, and was exposed to sunlight, the greatest amount of p-nitrophenol decomposed during which of the following time intervals?
Your Answer is
Correct Answer is F
Explanation
Look at figure 1, the line of TiO2+ sunlight has the largest slope when the abscissa is 0-30 min