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Chemistry CBSE Live product
Class 10 (2026-27)
Chemical reactions and equations
Combination and decomposition reaction
6.
Types of chemical reaction
Question:
3
m.
Go through the following question and provide the answer:
Identify the type of each of the following reactions stating the reason for your answers.
i. \(2Mg + O_2 → 2MgO\)
ii. \(H_2O → H_2 + O_2\)
i.
Type of reaction -
Decomposition
Displacement
Endothermic
Combination
Reason:
Magnesium and oxygen exchange atoms to form magnesium oxide
Magnesium breaks down into \(Mg^2+\) ions and reacts with oxygen
Oxygen displaces magnesium to form magnesium oxide
Magnesium reacts with oxygen to form a single compound magnesium oxide
ii.
Type of reaction -
Electrolytic decomposition
Displacement
Photolytic decomposition
Redox
Reason:
Hydrogen reacts with oxygen to form water
Water breaks down into hydrogen and oxygen in presence of electric current
Water combines with hydrogen to form hydrogen and oxygen
Water breaks down into hydrogen and oxygen in presence of heat
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