Question

Which of the following is an example of single displacement reaction?

• A. ${\text{CaCO}}_3{}^{\underrightarrow{\text{heat}}}\text{CaO}+{\text{CO}}_2$
• B. $CaO$ + $2HCl$ $\to$ $CaC{l}_2$ + $H_{2}O$
• C. $Fe$ + $CuS{O}_4$ $\to$ $FeS{O}_4$ + $Cu$
• D. $NaOH+HCl$ $\to$ $NaCl$ + $H_{2}O$

Answer 1

The correct option is C $Fe$ + $CuS{O}_4$ $\to$ $FeS{O}_4$ + $Cu$

This is the only single displacement reaction in the given options: $Fe$ + $CuS{O}_4$ $\to$ $FeS{O}_4$ + $Cu$
Here, iron (Fe) replaces or displaces copper (Cu) from its solution.

The reaction of calcium carbonate is a decomposition reaction because one compound decomposes to give two compounds.

The reaction of calcium oxide with hydrochloric acid and reaction of sodium hydroxide with hydrochloric acid, both are type of double displacement reaction.