question_answer

Three test tubes are set up as shown. The indicator used here changes from red to yellow when exposed to increased levels of carbon dioxide. At the start of the experiment, the indicator in each test tube was red.

What will be the colour of the indicator in each test tube after two hours?

   

A)

A	B	C
Yellow	Yellow	Red

B)       

A	B	C
Red	Yellow	Red

C)

A	B	C
Yellow	Red	Red

D)

A	B	C
Yellow	Yellow	Yellow