In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: The solubility of copper hydroxide in the presence of a high concentration of ammonia:
Options: <1> Increased by formation of a complex ion of Cu2 + with NH3. <2> It is not affected because there is no common ion effect. <3> Decreases by common ion effect. <4> It decreases upon oxidation of bromide to molecular bromine. <5> It decreases because the hydroxides are more soluble in acidic medium.
1