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Question

Match the following reactions with their respective types of reactions .


Your Answer
A
Combination 
Your Answer
B
Decomposition
Your Answer
C
Displacement

Solution

The correct option is
Burning of magnesium is a combination reaction as magnesium combines with oxygen to give magnesium oxide.

2Mg(s)+O2(g)2MgO(s)

Heating of calcium carbonate gives calcium oxide and carbon dioxide, which is a decomposition reaction.

2CaCO3(s)2CaO(s)+CO2(g)

When magnesium is treated with HCl, it displaces hydrogen from HCl and forms MgCl2. Hence, it is a displacement reaction.

Mg(s)+2HCl(aq)2MgCl2(aq)+H2(g)

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