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Question:

The equation which is balanced and represents the correct product is:
[Mg(H2O)6]2+ + (EDTA)4- + excess NaOH → [Mg(EDTA)]2+ + 6H2O
CuSO4 + 4KCN → K2[Cu(CN)4] + K2SO4
[CoCl(NH3)5]+ + 5H+ → Co2+ + 5NH4+ + Cl-
Li2O + 2KCl → 2LiCl + K2O

[CoCl(NH3)5]+ + 5H+ → Co2+ + 5NH4+ + Cl-

CuSO4 + 4KCN → K2[Cu(CN)4] + K2SO4

Li2O + 2KCl → 2LiCl + K2O

[Mg(H2O)6]2+ + (EDTA)4- + excess NaOH → [Mg(EDTA)]2+ + 6H2O

Solution:

Equation - 1 is not balanced with respect to charge.
Equation - 2 gives K3[Cu(CN)4] as product.
Equation - 3 reaction is unfavourable in the forward direction (K2O is unstable, while Li2O is stable).
Equation - 4 is correct and balanced.