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

  1. A

    CuSO4+4KCNK2Cu(CN)4+K2SO4

  2. B

    Li2O+2KCl2LiCl+K2O

  3. C

    CoClNH35++5H+Co2++5NH4++Cl

  4. D

    MgH2O62++EDTA4 excess NaOH[Mg(EDTA)]2++6H2O

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    Solution:

    Equation - 1 is not balanced with respect to charge.

    Equation - 2 gives K3Cu(CN)4 as product.

    Equation - 3 reaction is unfavourable in the forward direction (K2O is unstable, while LiO2 is stable).

    Equation - 4 is correct and balanced.

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