The four test-tubes are arranged as shown. They are left in a water-bath at $20\degree\text{C}$, in the light, for two hours. In which test-tube will the hydrogencarbonate indicator become yellow?
Biology 0610 · IGCSE · Photosynthesis
The four test-tubes are arranged as shown. They are left in a water-bath at $20\degree\text{C}$, in the light, for two hours. In which test-tube will the hydrogencarbonate indicator become yellow?