Question on: JAMB Chemistry - 2023
When anhydrous cobalt chloride paper is exposed to water, what color change is observed?
A
From pink to blue
B
From white to blue
C
From blue to white
D
From blue to pink
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Correct Option: D
Anhydrous cobalt chloride paper is blue. When it is exposed to water or moisture, it undergoes a reversible chemical reaction with water.
This reaction leads to the formation of hydrated cobalt chloride, which is pink.
Therefore, the colour change observed when anhydrous cobalt chloride paper comes into contact with water is from blue to pink. This property is often used as an indicator for the presence of moisture or humidity in a given environment.
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