1.

Write the chemical equation of the reaction in which the following changes have taken place with an example of each.

Answer»

i) Change in colour

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag.

The solution will become blue in colour and shining silver metal will be deposited

ii) Change in temperature.

NaOH + HCl → NaCl + H2O + Heat.

The temperature will increase because heat is evolved.

iii) Formation of precipitate.

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

Yellow PPt

Yellow precipitate of Phi, will he formed.



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