Given below is the diagram of an experimental setup to study the process of Transpiration. Cobalt chloride papers are fixed on the upper as well as lower surface of the leaf. Answer the questions that follow: Given below is the diagram of an experimental setup to study the process of Transpiration. Cobalt chloride papers are fixed on the upper as well as lower surface of the leaf. Answer the questions that follow:
What is the colour of dry cobalt chloride paper?
Topic: Colour of dry cobalt chloride paper
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
(b) Blue.
Dry cobalt chloride paper is BLUE. On absorbing moisture it turns PINK.
That single colour change is what makes the whole experiment possible: the paper records the arrival of water vapour without any measurement being taken.
Learn it as a pair, because a question may ask for either state: DRY — BLUE MOIST — PINK
The paper must be freshly dried before use, since it absorbs moisture from the air and would otherwise already be pink before the experiment began.
Blue.