Question

Which of the following reactions are considered as neutralization reactions? Why? 

1) NaOH + HCl → NaCl + H₂O 

2) CaO + 2 HCl → CaCl₂ + H₂O 

3) CO₂ + 2 NaOH → Na₂CO₃ + H₂O 

4) SiO₂ + CaO → CaSiO₃

Answer 1

All of them are considered as neutralization reactions.

1. An acid (HCl) reacts with base (NaOH) and forms salt and water. So it is a neutralization reaction.

2. Here metallic oxide which is basic in nature reacts with acid and forms salt and water. So it is also a neutralization reaction. 

3. In third case non-metallic oxide (acidic oxide) reacts with base (NaOH) and forms salt and water. So it is also a neutralization reaction. 

4. In fourth case a metallic oxide (CaO) reacts with non-metallic oxide (SiO₂) and forms salt. So it is also a neutralization reaction in the absence 6f water.