The salt that will form a precipitate soluble in excess ammonia solution is

The question is asking which of the given salts will form a precipitate that is soluble in excess ammonia solution. When a salt is soluble in water, it dissolves completely in water, forming a clear solution. When a salt is insoluble in water, it does not dissolve in water, forming a precipitate. In this case, the question is asking for a salt that will form a precipitate that is soluble in excess ammonia solution. To answer the question, we need to know which of the given salts will react with excess ammonia solution to form a complex ion that is soluble in water. The only salt among the given options that will do this is copper (II) nitrate, Cu(NO3)2. When excess ammonia solution is added to copper (II) nitrate, a deep blue complex ion, [Cu(NH3)4]2+, is formed, which is soluble in water. The other salts among the given options will form precipitates that are insoluble in excess ammonia solution. Therefore, the salt that will form a precipitate soluble in excess ammonia solution is copper (II) nitrate, Cu(NO3)2.