7) After adding ammonia to the test solution, a precipitate formed, which completely dissolved in the excess of the reagent. The following combinations of ions may be present in this solution:
A) Mg2 Ni2 Na
B) Cu2 Cd2 Al3
C) K Zn2 Cd2
D) Hg2NaBi3
E) Mn2 K Ni2
Write the equations for the corresponding reactions.

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