Chemistry
Explain the different types of double decomposition reactions by giving suitable equations.
Answer
Different types of double decomposition reactions are:
Precipitation reaction — A reaction between two compounds in aqueous solution state to give two new compounds one of which is insoluble (precipitate) is called a Precipitation reaction.
For example, when H2S is passed through copper sulphate solution, a black precipitate of copper sulphide is obtained.
CuSO4 (aq) + H2S (g) ⟶ CuS [black ppt.] ↓ + H2SO4Neutralization reaction — The reaction between an acid and a base that forms salt and water only is referred to as Neutralization reaction.
For example, Sodium chloride (base) reacts with HCl (acid) to form salt and water only.
NaOH + HCl ⟶ NaCl + H2O
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Balance these reactions and state what type of reactions they are:
(a) NaNO3 ⟶ NaNO2 + O2
(b) AgNO3 + Zn ⟶ Zn(NO3)2 + Ag
(c) Fe + HCl ⟶ FeCl2 + H2
(d) AgNO3 ⟶ Ag + NO2 + O2
(e) NaBr + Cl2 ⟶ NaCl + Br2
(f) PbO + C ⟶ Pb + CO2
(g) KClO3 ⟶ KCl + O2
(h) AgNO3 + HCl ⟶ AgCl ↓ + HNO3
(i) NH3 + HCl ⟶ NH4Cl
(j) N2 + H2 ⟶ NH3