Write the chemical equations for the following activities.

A. NaOH solution was added to HCl solution.

B. Zinc dust was added to dilute

C. Dilute nitric acid was added to calcium oxide.

D. Carbon dioxide gas was passed through KOH solution.

E. Dilute HCl was poured on baking soda.

A. When NaOH solution was added to HCl solution, it forms sodium chloride and liberated hydrogen gas.

HCl + NaOH → NaCl + H₂

B. When zinc dust was added to dilute H₂SO₄, it forms zinc sulphate and liberated hydrogen gas.

H₂SO₄ + Zn → ZnSO₄ + H₂

C. When dilute nitric acid was added to calcium oxide, it forms calcium nitrate and water.

2HNO₃ + CaO → Ca(NO₃)₂ + H₂O

D. When carbon dioxide gas was passed through KOH solution; it was completely absorbed by KOH.

CO₂ + KOH → KHCO₃

E. When dilute HCl was poured on baking soda (NaHCO₃), it forms a salt NaCl, water and releases bubbles of carbon dioxide.

NaHCO₃ + HCl → NaCl + H₂O+ CO₂

The above reaction is an example of neutralization reaction.