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Combination Reaction

 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.

Activity – 5

Examples of combination reactions

(a) between two elements

(b) between two compounds

(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.

Next –

Decomposition Reaction

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