Question

5. Classify the following reactions as chemical combination, chemical decomposition or displacement reactions:
(a) A + B → AB
(b) AB → A + B
(c) Hydrogen + Oxygen → Water
(d) Aluminium + Iron oxide *Electric Current* → Iron + Aluminium oxide​

Answer 1

Answer:

a)combination reactions

b) displacement reaction

c)chemical decomposition

d) displacement reaction

Explanation:

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Answer 2

Answer:

(a) Combination (Synthesis)

A + B → AB

CO2(g) + H2O(l) → H2CO3(aq)

N2(g) + 2O2(g)→ 2NO2(g)

(b) Decomposition

AB → A + B

CaCO3(s) → CaO(s) + CO2(g)

(c) Reaction

Hydrogen + Oxygen → Water

(d) displacement reaction

Fe2O3 + 2Al → Al2O3 + 2Fe

It is an example of displacement reaction. Aluminium being more reactive than iron displaces iron and results in the formation of aluminium oxide. Aluminium is more reactive metal than Fe.