Will the white clothes rack turn yellow?

No, it's a yellow hanger. If it fades, it will turn white. If the white hanger turns yellow, it is not faded, but polluted. For example, clothes hangers that often dry dark clothes may be stained with faded pigments, so they look yellow. Because of this polluted color, it can't be cleaned if it is superimposed too much, and the color of the hanger will become mottled.