Solution of task 315 of Chemistry Book Shimanovich 2003

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315. When a solution of KCN is added to a solution of [Zn (NH) 3] 4SO4, a soluble complex compound K2 [Zn (CN) 4] is formed.
Write the molecular and ion-molecular equation of the reaction. The instability constant of which ion, [Zn (NH3) 4] 2+ or [Zn (CN) 4] 2 is larger? Why?

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