Identify the balanced single displacement reaction. cucl2 + fe ⟶ 2cu + feci2 pbcl4 + 2ca(oh)2 ⟶ 2cacl2 + pb(oh)4 cucl2 + fe ⟶ cu + feci2 pbcl4 + 2ca(oh)2 ⟶ 2cacl2 + 4pb(oh)

Explanation:

This is a single replacement reaction in which iron replaces copper from its salt solution. As iron is more reactive than copper , it easily loses electrons to convert to in and in accepts electrons to form .

The equation is also balanced as equal number of atoms of each element are present on reactant and product side.

1. : The equation is not balanced.

2. : This is a double displacement reaction and is balanced.

4.  : This is a double displacement reaction and is not balanced.