2) Write the chemical equation of the reaction in which the following

1.	2) Write the chemical equation of the reaction in which the following changes have taken place withan example of each: change in colour, change in temperature, formation of precipitate.
Answer» ★ Change in colour:Fe(s) + CuSO4 (aq) -----> FeSO4 (aq) + Cu(s)Blue colour solution changes into green colour solution due to displacement reaction. ★ Change in temperature:CaO(s) + H2O (l) -----> Ca(OH)2 + HeatTemperature increases means changes due to exothermic reaction. ★ Formation of precipitate:Pb(NO3)2 (aq) + 2KI(aq) ------> PbI2(s)↓ + 2KNO3(aq)PbI2 is a precipitate formed due to precipitation reaction or double displacement reaction.

2) Write the chemical equation of the reaction in which the following changes have taken place withan example of each: change in colour, change in temperature, formation of precipitate.

Answer»

★ Change in colour:Fe(s) + CuSO4 (aq) -----> FeSO4 (aq) + Cu(s)Blue colour solution changes into green colour solution due to displacement reaction.

★ Change in temperature:CaO(s) + H2O (l) -----> Ca(OH)2 + HeatTemperature increases means changes due to exothermic reaction.

★ Formation of precipitate:Pb(NO3)2 (aq) + 2KI(aq) ------> PbI2(s)↓ + 2KNO3(aq)PbI2 is a precipitate formed due to precipitation reaction or double displacement reaction.

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2) Write the chemical equation of the reaction in which the following changes have taken place withan example of each: change in colour, change in temperature, formation of precipitate.

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