Why does bleach turn yellow when mixed with red cabbage juice?

Bleach turns yellow when mixed with red cabbage juice due to the chemical reaction between the bleach (sodium hypochlorite) and the pigments in the cabbage juice, primarily anthocyanins. These pigments are sensitive to pH changes and can change color in response to different chemical environments. When bleach is introduced, it alters the pH and oxidizes the anthocyanins, resulting in a yellow hue. This color change is a visual indication of the chemical transformation occurring in the mixture.