Q
Which of the following reactants will come in place of A and give a neutralisation reaction? Ca(OH)2 + 2A → CaCl2 + 2H2O
RRB Group D, 23-Aug-22 S-2
2022
✓ Answer:
A
Hydrochloric acid
In the reaction Ca(OH)2 + A → CaCl2 + H2O, hydrochloric acid (HCl) acts as reactant A, reacting with calcium hydroxide to produce calcium chloride and water, exemplifying a neutralisation reaction. The balanced equation is: Ca(OH)2 + 2HCl → CaCl2 + 2H2O. Neutralisation involves an acid and a base reacting to yield water and a salt, with no excess hydrogen or hydroxide ions present.