Question

Identify the combination reaction(s) among the following:

• A. $2C_8{H}_{18}+25O_2\to 16C{O}_2+18H_{2}O$
• B. $8Fe+S_8\to 8FeS$
• C. $MgO+C{O}_2\to MgC{O}_3$
• D. $3Pb(N{O}_3{)}_2+2AlC{l}_3\to 3PbC{l}_2+2Al(N{O}_3{)}_3$

Answer 1

Answer: (B), (C)

The correct options are
B $8Fe+S_8\to 8FeS$
C $MgO+C{O}_2\to MgC{O}_3$

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:

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

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