Solution:
Concept- Salt and water are created when bases and acids interact. Neutralisation reactions are those in which acids and bases react to form salts. Take the interaction between sodium hydroxide and hydrochloric acid as an example.High amount of hydrochloric acid is found from the paper factory waste. We should treat the waste with a chemical containing sodium hydroxide before disposal, to make it safe because it gives us Sodium chloride, which is household, edible salt, and water .
The reaction is
HCl + NaOH→NaCl + H2O
Hence, the correct answer is option (1).
