Question

Write the chemical equation of the reaction in which the following changes have taken place with an example of each
1 change in colour
2 change in temprature
3 formarion of precipidate

Answer 1

Answer is in Attachment !

Answer 2

Change in colour
The chemical reaction between citric acid and purple coloured potassium permanganate solution is characterized by change in colour

3KMnO4 + C6H8O7 = 3HMnO4 + C6H5K3O7

Change in temperature
Calcium oxide (quicklime) reacts with water and form slaked lime

CaO + H20 = Ca(OH)2 and release a lot of heat energy which can even boil the water.

Formation of precipitate
When potassium iodide solution is added to a solution of Lead Nitrate then yellow precipitate of lead iodide is formed.
Pb(NO3)2 + 2KI = PbI2 + 2KNO3
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