Of which type is each of the following reactions?
(a) CaO + H2O —> Ca(OH)2 + Heat
(b) C+ O2 —>CO2
(c) Cl2+ H2 --> 2HCl
(d) 2Mg + O2---> 2MgO
(a) Exothermic reaction. Because on the product side heat is emitted. Exothermic reaction is one where heat is emitted.
(b) Combination reaction. Carbon and Oxygen combines together under certain condition to form carbon dioxide.
But this reaction can be a Combustion Reaction also. Because the burning of a compound with evolution of considerable amount of heat energy is called combustion. In this reaction C (carbon) is burnt in O2 (Oxygen) and release heat energy.
(c) Combination Reaction as well as Reduction reaction.
As Hydrogen is added, this is a reduction reaction. And two compounds combine to form one, so a combination reaction too.
(d) This is a Combination and Oxidation reaction. As two products are added, it’s a combination, while oxygen is one of the reactant which is added to the products, so it’s an oxidation reaction.
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