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

Question

[Mg (H₂O)₆ ]²⁺ + (EDTA)^4- $$\buildrel {excess\,NaOH} \over \longrightarrow $$ [Mg (EDTA) ]²⁺ + 6H₂O

CuSO₄ + KCN $\to$ K₂ [Cu (CN)₄] + K₂SO₄

Li₂O + 2KCl $\to$ 2LiCl + K₂O

[CoCl(NH₃)₅]⁺ + 5H⁺ $\to$ Co²⁺ + $5NH_4^+$ + Cl^-

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