(i)Hydronium ions will be produced (ii)Heat is released during dissolution (iii)The process is endothermic (iv)Hydroxide ions will be produced

Ca(OH)₂ (aq) + 2 NH₄Cl (g) → CaCl₂ (s) + 2H₂O (l) + 2NH₃ (g) ↑ So, X = NH₄Cl & Y= 2HO When base Ca(OH)₂ combines with ammonium salt, NH₄Cl, then it liberates ammonia gas and forms calcium ...