Question

Identify the examples of combination reaction from the options given below.

• A. $3{\text{Pb(NO}}_3{)}_2\text{(aq)}+2{\text{AlCl}}_3\text{(aq)}$ $\to$ $3{\text{PbCl}}_2\text{(s)}\downarrow +2\text{Al}{\text{(NO}}_3{)}_3\text{(aq)}$
• B. $\text{Fe(s)}+{\text{CuSO}}_4\text{(aq)}\to {\text{FeSO}}_4\text{(aq)}+\text{Cu(s)}$
• C. $\text{MgO(s)}+{\text{CO}}_2\text{(g)}\to {\text{MgCO}}_3\text{(s)}$
• D. $8\text{Fe(s)}+{\text{S}}_8\text{(s)}\to 8\text{FeS(s)}$

Answer 1

Answer: (C), (D)

$8\text{Fe(s)}+{\text{S}}_8\text{(s)}\to 8\text{FeS(s)}$

In a combination reaction, two or more reactants combine to form a single product. The general representation of this reaction is:
$\text{A+B}\to \text{C}$
Among the given reactions, the following are undergoing combination reaction:
$8\text{Fe(s)}+{\text{S}}_8\text{(s)}\to 8\text{FeS(s)}$
$\text{MgO(s)}+{\text{CO}}_2\text{(g)}\to {\text{MgCO}}_3\text{(s)}$