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Question

Identify the reaction, give example with equation.
(I) products become hot/warm
(II) product is in soluble
(III) product cools down.

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Solution

(i) Product becomes hot/warm:-
Any exothermic reaction, i.e. reactions which involve release of heat make the product hot/warm.
Eg:- All combustion reactions, A neutralization reaction etc.
NaOH(aq)+HCl(aq)NaCl(aq)+H2O(l)+Heat
sodiumHydro sodium water
hydroxide chloro acidcloride
ΔG=52kL/mol
(ii) Product is in soluble:-
Technical reaction in which the product remain as a precipitate which is soluble.
2AgNO3(aq)+MgBr22AgBr(s)+Mg(NO3)2(aq)
silver nitrate magnesium silver Magnesium
Bromide Bromide Nitrate
In the above reaction silver Bromide (AgBr) remains as a precipitate as it is insoluble in aquas magnesium nitrate.
(iii) Product cools down:-
Any endothermic reaction i.e, reactions which involve absorption of energy from the surroundings eventually cools down the products.
Eg:-
NH4Cl(s)+H2O(l)NH4Cl(aq)Heat
Ammonium Water aqeous
cloride Ammonium
cloride

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