Identify the reaction, give example with equation.
$(I)$ products become hot/warm
$(I I)$ product is in soluble
$(I I I)$ 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.
$N a O H (a q) + H C l (a q) ⟶ N a C l (a q) + H_{2} O (l) + H e a t$
sodiumHydro sodium water
hydroxide chloro acidcloride
$Δ G = - 52 k L / m o l$
(ii) Product is in soluble:-
Technical reaction in which the product remain as a precipitate which is soluble.
$2 A g N O_{3} (a q) + M g {B r}_{2} ⟶ 2 A g B r (s) + M g {({N O}_{3})}_{2} (a q)$
silver nitrate magnesium silver Magnesium
Bromide Bromide Nitrate
In the above reaction silver Bromide $(A g B r)$ 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:-
$N H_{4} C l (s) + H_{2} O (l) ⟶ {N H}_{4} C l (a q) - H e a t$
Ammonium Water aqeous
cloride Ammonium
cloride

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