Nickel Forms Three Complexes with Hydroxide,NiOH⁺ (Aq),Ni(OH)₂ (Aq)and Ni(OH (Aq)

question 20

Multiple Choice

Nickel forms three complexes with hydroxide,NiOH⁺ (aq) ,Ni(OH) ₂ (aq) and Ni(OH (aq) .Which statement(s) regarding the impact of complex formation on the solubility of nickel hydroxide are FALSE?
I Hydroxide behaves as a Lewis acid when forming a complex with nickel.
II The total nickel concentration is [Ni²⁺]_tot = [Ni²⁺] + [NiOH⁺] + [Ni(OH) ₂] + [Ni(OH].
III As [OH^-] increases,the solubility of Ni(OH) ₂ initially decreases but then increases.
IV

• A)Only I
• B)II and III
• C)Only III
• D)Only IV
• E)I,II,III,and IV

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