Which of these hydroxides is amphoteric? Watch

Henny987
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Which of these hydroxides is amphoteric?

A Cu(OH)2

B Mg(OH)2

C Ni(OH)2

D Zn(OH)2
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alstudent_2019
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Copper as transition metals exhibit amphoteric behaviors as complex ions. Note that Zn is not a transition metal, only a metal in the d-block. The rest not being transition metals or d-blocks

Therefore A
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Henny987
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(Original post by alstudent_2019)
Copper as transition metals exhibit amphoteric behaviors as complex ions. Note that Zn is not a transition metal, only a metal in the d-block. The rest not being transition metals or d-blocks

Therefore A
The mark scheme said the answer was D which i have no clue how that can be right. Also isnt nickel a transition metal too?
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alstudent_2019
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(Original post by Henny987)
The mark scheme said the answer was D which i have no clue how that can be right. Also isnt nickel a transition metal too?
Sorry did not see C.
Now I'm confused too. did a bit of research and turns out Nickel can be amphoteric too, along with copper.
https://en.wikipedia.org/wiki/Amphoterism
First line of this page.
Sorry
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CuriosityYay
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(Original post by Henny987)
Which of these hydroxides is amphoteric?

A Cu(OH)2

B Mg(OH)2

C Ni(OH)2

D Zn(OH)2
It is D as the mark scheme says.

The reason I chose D is that I remember from IGCSE the tests for cations and here the Zinc ion which forms with sodium hydroxide and ammonia a white precipitate forms which dissolves with excess ammonia because it forms a complex ion and also dissolves with sodium hydroxide because it is amphoteric.

Hope that helps!
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