Which of the following is NOT a single replacement reaction?(1 point)

Question

2 Na (s) + Cl₂ (g) ⟶ 2 NaCl (s)
Mg(s) + 2 HCl (aq) ⟶ MgCl₂ (aq) + H₂ (g)
2 Na (s) + 2 H₂O (l) ⟶ 2 NaOH (aq) + H₂ (g)
Fe (s) + CuCl₂ ⟶ FeCl₂ (aq) + Cu(s

Answer 1

The reaction that is NOT a single replacement reaction is:

2 Na (s) + Cl₂ (g) ⟶ 2 NaCl (s)

This is a synthesis reaction (or combination reaction) where sodium and chlorine gas combine to form sodium chloride. The other reactions involve one element replacing another in a compound, which is characteristic of single replacement reactions.