Question

Which of the following reactions represents a combination reaction?
(1) 2 H2O → 2H2+O2 (2) CaO+H2O →Ca(OH)2 (3) CaCO3→ CaO + CO2 (4) Both (1) and (3)

Answer 1

Answer:

option 2 represents combination reaction

opt 1 and 3 represent decomposition reaction

Answer 2

(2) $CaO + H_{2} O$ → $Ca(OH)_{3}$ represents a combination reaction.

Combination reaction:

• A combination reaction occurs when two reactants combine to form one product.
• Oxygen and halogens are highly reactive elements that are prone to combining with other elements.
• A direct reaction occurs when two or more elements or compounds combine to form a single compound.
• These reactions are represented by equations of the form X + Y → XY.
• A combination reaction occurs when two or more elements combine to form one compound.
• The combination reaction occurs when two or more reactants combine to form a new product.
• The synthesis reaction is another name for the combination reaction.
• Hydrogen, for example, is combined with chlorine to form hydro-chloride.

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