Concept:Ammonium salts form acidic solutions when they dissolve in water.
Explanation:When an ammonium salt dissolves, the ammonium ion
NH4+ acts as a weak acid.
It donates a proton to water:
NH4++H2O⇌NH3+H3O+.
The formation of
H3O+ makes the solution acidic.
Therefore, the
pH of the resulting solution is less than 7.
Ammonium salts are usually soluble in water, so option D is incorrect.
They decompose on heating to release ammonia and the corresponding acid, so option C is also incorrect.
Among the given choices, option B correctly describes the acidic nature of an ammonium salt solution.
Answer:B. dissolves in water to form solution of
pH<7