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Question

Give one example each of a chemical reaction characterised by:
(a) evolution of a gas
(b) formation of a precipitate
(c) change in temperature
​Write equations of the reactions which take place in each case.

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Solution

(a) When zinc granules react with dilute sulphuric acid in a flask, hydrogen gas is evolved and zinc sulphate solution is formed.
Zn(s)+H2SO4(aq)ZnSO4(aq)+H2(g)

(b) When potassium iodide is added to lead nitrate solution (colourless and clear), a yellow precipitate of lead iodide solution is formed.
Pb(NO3)2(aq)+2KI(aq)PbI2(s)+2KNO3(aq)

(c) When quick lime reacts with water, slaked lime is formed along with release of a large amount of heat, causing a change in temperature in the reaction mixture.
CaO(s)+H2O(l)Ca(OH)2(aq)+Heat

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