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

Question 4

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 Nickel forms three complexes with hydroxide,NiOH<sup>+</sup> (aq) ,Ni(OH) <sub>2</sub> (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 [Ni<sup>2+</sup>]<sub>tot</sub> = [Ni<sup>2+</sup>] + [NiOH<sup>+</sup>] + [Ni(OH) <sub>2</sub>] + [Ni(OH]. III As [OH<sup>-</sup>] increases,the solubility of Ni(OH) <sub>2</sub> 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


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

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