Select the correct, balanced net-ionic equation from the list (A - J), for each

Question

Select the correct, balanced net-ionic equation from the list (A - J), for each of the reactions. Zn(OH)2(s) dissolves in excess aqueous ammonia with the formation of Zn(NH3)42+(aq) AgCl(s) dissolves in excess aqueous ammonia with the formation of Ag(NH3)2+(aq) Co(OH)2(s) dissolves in excess aqueous ammonia with the formation of Co(NH3)42+(aq) These solutions are basic. No aqueous molecule or ion which is more acidic than NH4+ should appear in the equations. Co(OH)2(S) rightarrow Co2+(aq)+ 2OH-(aq) Ag +(aq) + CI-(aq) + 2NH3(aq) rightarrow Ag(NH3)2+(aq) + CI-(aq) Co(OH)2(s) + 4NH3(aq) rightarrow Co(NH3)42+(aq) + 2OH-(aq) AgCl(s) + 2NH4+(aq) rightarrow Ag(NH3)2+(aq) + 2H+(aq) + CI-(aq) Zn(OH)2(s) + 4NH3(aq) rightarrow Zn(NH3)42+(aq) + 2OH-(aq) Zn(OH)2(s) + 2NH3(aq) + 2H2O(I) rightarrow Zn(OH)42-(aq) + 2NH4+(aq) Co(OH)2(s) + 2NH4 +(aq) rightarrow Co2+(aq) + 2NH3(aq) + 2H2O(I) AgCl(S) + 2NH3(aq) rightarrow Ag(NH3)2+(aq) + CI-(aq) Zn(OH)2(s)+ 4NH3(aq) rightarrow Zn(NH3)42+(aq) none of the above

Explanation / Answer

Zinc hydroxide dissolves in excess aqueous ammonia. Zn (OH) 2    + 4NH3 --------> Zn(NH3)42+ + 2 OH- AgCl dissolves in excess ammonia AgCl (s) + 2 NH3 ---------> Ag(NH3)2+ + Cl - Co (OH)2 dissolves in excess ammonia. Co (OH)2 +   4 NH3------>   Co(NH3)42+ + 2 OH- Co (OH)2 dissolves in excess ammonia. Co (OH)2 +   4 NH3------>   Co(NH3)42+ + 2 OH-

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