Chemistry
State which type of chemical reactions proceed with -
(a) Evolution of heat energy
(b) Absorption of heat energy.
State in each of the following reactions whether heat is evolved or absorbed
(i) water is added to quicklime
(ii) two neutral gases on passage through an electric arc give nitric oxide
(iii) two neutral gases combine to give - a basic gas.
Chemical Reaction
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Answer
(a) Exothermic reaction
(b) Endothermic reaction
(i) Exothermic reaction, heat is evolved.
CaO + H2O ⟶ Ca(OH)2 + Δ
(ii) Endothermic reaction, heat is absorbed.
N2 + O2 2NO - Δ
(iii) Exothermic reaction, heat is evolved.
N2 + 3H2 2NH3 + Δ
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