Question

What type of chemical reaction is shown in the below equation?
\[Z{n_{\left( s \right)}} + CuS{O_{4\left( {aq} \right)}} \to ZnS{O_{4\left( {aq} \right)}} + C{u_{\left( s \right)}}\]
A. Combination reaction
B. Dissociation reaction
C. Displacement reaction
D. Double displacement reaction

Answer 1

Hint: Chemical reaction is a change of reactants into products. These chemical reactions are classified into different types like combination reactions, dissociation reactions, displacement reactions and double displacement reactions. In the displacement reaction the least reactive component is displaced by the most reactive component.

Complete answer:
Periodic table consists of a total of \[118\]elements in the increasing order of atomic numbers arranged in the vertical columns and horizontal rows. The vertical columns are called groups and the horizontal rows are called periods. Zinc is an element with atomic number \[30\], copper is an element with atomic number \[29\].
Zinc is more reactive than copper. Both copper and zinc are electropositive and exist as cations. These both atoms become ions and form bonds with anions like sulphate and phosphates.
Copper sulphate is a salt. Zinc sulphate is also a salt. Copper sulphate mostly exists as a hydrated salt and is blue in colour. Whereas zinc sulphate is colourless.
Copper sulphate has a molecular formula of \[CuS{O_4}\], and the molecular formula of zinc sulphate is \[ZnS{O_4}\].
When Zinc metal is treated with copper sulphate, copper is displaced by zinc and forms zinc sulphate and copper metal.
The chemical reaction involved is: \[Z{n_{\left( s \right)}} + CuS{O_{4\left( {aq} \right)}} \to ZnS{O_{4\left( {aq} \right)}} + C{u_{\left( s \right)}}\]
Thus, it is an example of displacement reaction.
So, the correct answer is “Option C”.

Note:
In displacement reactions, the least reactive element can be displaced by the most reactive element. In the given reaction, zinc is more reactive and copper is least reactive. The chemical change can be noticed by the disappearance of the blue colour of copper sulphate.