Question

The anhydrous salt which changes colour on reaction with water.
A: Calcium sulphate B. Sodium sulphate
C: Cobalt chloride
D. Calcium chloride​

Answer 1

Answer:

Calcium chloride.D..........

Answer 2

Answer: D. Calcium chloride​ is an anhydrous salt that changes color in reaction with water.

Explanation:

Deliquescent substances include calcium chloride. When anhydrous calcium chloride is exposed to the air, it will take in enough water to dissolve. After a short while, you will have a pool of clear liquid rather than a lump of white substance. All water (including condensation, vapor, etc.) in the environment will be absorbed by anhydrous calcium chloride. By altering the chemical structure of the water, it effectively traps it. When water is added, calcium chloride dissolves into a white solution. Deliquescent calcium chloride can absorb enough moisture to transform from a solid state to a liquid one, which is brine. Solid calcium chloride releases heat when it dissolves in water due to an exothermic process.

Hence, Calcium chloride​ is an anhydrous salt that changes color in reaction with water.

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