Question

Identify the combination reaction(s) among the following:

• A. $\text{MgO(s)}+{\text{CO}}_2\text{(g)}\to {\text{MgCO}}_3\text{(s)}$
• B. $3{\text{Pb(NO}}_3{)}_2\text{(aq)}+2{\text{AlCl}}_3\text{(aq)}\to 3{\text{PbCl}}_2\text{(s)}+2{\text{Al(NO}}_3{)}_3\text{(aq)}$
• C. $2{\text{C}}_8{\text{H}}_{18}\text{(s)}+\text{2}5{\text{O}}_2\text{(g)}\to 16{\text{CO}}_2\text{(g)}+18{\text{H}}_2\text{O(g)}$
• D. $8\text{Fe(s)}+{\text{S}}_8\text{(s)}\to 8\text{FeS(s)}$

Answer 1

Answer: (A), (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 combination reaction is given below:
$\text{A+B}\to \text{C}$.
Only in the reactions given below the two reactants are combining to form one single product:

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

$\text{MgO(s)}+{\text{CO}}_2\text{(g)}\to {\text{MgCO}}_3\text{(s)}$