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The equation which is balanced and represents the correct product(s) is

1. Li2O + 2KCl → 2LiCl + K2O
2. [CoCl(NH3)5]2+ + 5H+ → Co2+ + 5NH4+ + Cl−
3. [Mg(H2O)6]2+ + (EDTA)4− excess NaOH → [Mg(EDTA)]2− + 6H2O
4. [CuSO4·4KCN → K2[Cu(CN)4] + K2SO4

Correct answer: [CoCl(NH3)5]2+ + 5H+ → Co2+ + 5NH4+ + Cl−

Solution

This equation is balanced as it maintains the same number of each type of atom on both sides, ensuring conservation of mass, and accurately represents the dissociation of the complex ion into its constituent ions.

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