Combination reactions are those reactions in which two or more reactants (elements and / or compounds) combine to produce a single product.
It means, no side product is formed during such reactions. Heat changes may take place during the reaction.
Examples of combination reactions
(c) between an element and a compound
Calcium oxide or quick lime reacts with water to give calcium hydroxide or slaked lime [Ca(OH)2 ]. It is used for white washing walls. It reacts slowly with CO2 in air and form a thin layer of calcium carbonate on the walls after 2 – 3 days of white washing and gives a shiny finish.
Ca(OH)2 (aq) + CO2 (g) →CaCO3 (s) + H2O(l)
Which of the reaction is not a combination reaction ?
(a) CaO + H2O → Ca(OH)2
(b) CaO + CO2 → CaCO3
(c) NH3 + HCl → NH4Cl
(d) CaCO3 → CaO + CO2
Define and give one example of combination reaction.
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