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

Options

A. `CuSO_(4)+4KCNrarrK_(2)[Cu(CN)_(4)]+K_(2)SO_(4)`
B. `Li_(2)O+2KClrarr2LiCl+K_(2)O`
C. `[CoCl(NH_(3))_(5)]^(+)+5H^(+)rarrCo^(2+)+5NH_(4)^(+)+Cl^(-)`
D. `[Mg(H_(2)O)_(6)]^(2+)+(EDTA)^(4-)overset("excess NaOH")[Mg(EDTA)]^(2+)+6 H_(2)O`

Answer

C

Explanation

(a) `2CuSO_(4)+10KCNrarr2K_(3)[Cu(CN)_(4)]+2K_(2)SO_(4)+(CN)_(2)`
(b) Reaction is unfavourable in the forward direction as `K_(2)O` is unstable while `Li_(2)O` is stable.
(c ) Complex `[CoCl(NH_(3))_(5)]^(+)` decomposes to `NH_(4)^(+)` salt under acidic medium.
(d) `[Mg(H_(2)O)_(6)]^(2+)+(EDTA)^(4-)rarr[Mg(EDTA)]^(2-)+6H_(2)O`
Thus, this reaction is unbalanced with respect to charge.