Which one of the following compounds produces 4 ions per formula unit by dissoci

Question

Which one of the following compounds produces 4 ions per formula unit by dissociation when dissolved in water? Are all these below aqueous and did I do them correctly?

A) (NH4)2SO4 (NH4)2SO4(aq) —> NH4+(aq) + SO4 2-(aq)
B) Ca(NO3)2 Ca(NO3)2(aq) —> Ca2+(aq) + NO3-(aq)
C) Li3PO4 Li3PO4(aq) —> Li+(aq) + PO4 3-(aq)
D) (NH4)4Fe(CN)6 (NH4)4Fe(CN)6(aq) —> NH4+(aq) + Fe (what is Fe's charge and is it aqueous?) + CN-(aq)

Can you explain how this answer is D? What does 4 ions per formula unit mean?

Explanation / Answer

(NH4)2SO4(aq) —> NH4+(aq) + SO42-(aq) [ Two ions are produced ]

Ca(NO3)2(aq) —> Ca2+(aq) + 2NO3-(aq) [ Three ions are produced ]

Li3PO4(aq) —> 3Li+(aq) + PO43-(aq) [ Four ions are produced ]

(NH4)4Fe(CN)6(aq) —> 4NH4+(aq) + Fe2+(aq) + 6 CN-(aq) [ Eleven ions are produced ]

ions per formula unit mean: The salt which gives number of ions in aqueous condition.

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