When Cao is added to water taker in a beaker, rise in temperature is observed . However when Ba(OH)2is mixed with NH4Cl , a fall in temperature is observed . Why? Write the chemical equation as well.
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Case I :-
When CaO is added to water taker in a beaker, rise in temperature is observed because it is an Exothermic reaction. (In Exothermic reaction heat is released during the reaction.)
→CaO + H₂O ⇒ Ca(OH)₂
Case II :-
When Ba(OH)₂ is mixed with NH₄Cl , a fall in temperature is observed because it is an Endothermic Reaction. (In Endothermic Reaction heat is absorbed during the reaction.)
→Ba(OH)₂ + NH₄Cl ⇒ BaCl₂ + 2H₂O + 2NH₃
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