These 3 questions deal with the following chemical reaction: (green solution) Ni ^ 2+ (…

These 3 questions deal with the following chemical reaction:
\(\underset{\text { (green solution) }}{\mathrm{Ni}^{2+}(\mathrm{aq})}+6 \mathrm{NH}_{3}(\mathrm{aq}) \rightleftharpoons \underset{\text { (BheSolution) }}{\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}(\mathrm{aq})}\)
When H⁺(aq) is added, the colour green is favoured. Use one or more of the following interpretations to answer the questions.
I. Some unreacted Ni²⁺ (aq) is present in the solution at equilibrium.
II. Some unreacted NH₃ (aq) is present in the solution at equilibrium.
III. The colour change indicates new equilibrium conditions with reduced [Ni(NH₃)₆]²⁺(aq).
IV. The colour change indicates new equilibrium conditions with increased [Ni(NH₃)₆]²⁺(aq).
 
The disappearance of colour on addition of H⁺ (aq). supports interpretation(s)