Cd^+2 is amphoteric and forms ammonia complexes; while, Cu^+2 is NOT amphoteric

Question

Cd^+2 is amphoteric and forms ammonia complexes; while, Cu^+2 is NOT amphoteric but forms ammonia complexes. Which reagent should be used to seperate solid Cd(OH)_2 from solid Cu(OH)_2? excess HNO_3 excess NaCl excess NH_3 excess NaOH water An aqueous solution contains Mg^+2 and Pb^+2. The Pb^+2 is amphoteric; while the Mg^+2 is not. Addition of limited NaOH will result in precippitation of_________; while, addition of excess NaOH will result in precippitation of_____________. Mg(OH)_2 and Pb(OH)_2 Pb(OH)_2 Mg(OH)_2; Mg(OH)_2 and Pb(OH)_2 Pb(OH)_2; Mg(OH)_2 nothing; Pb(OH)_2 Mg(OH)_2 and Pb(OH)_2 Mg(OH)_2

Explanation / Answer

In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid as well as a base.

D. excess NaOH should be used to dissolve Cu(OH)2 as it is amphoteric

Similarly D is the correct answer for second part

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