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The equation which is balanced and represents the correct products is -

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

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

Solution

This option correctly balances the charges and atoms on both sides of the equation, showing that the complex ion dissociates into cobalt ions, ammonium ions, and chloride ions, maintaining mass and charge conservation.

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