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Question

The pair of amphoteric hydroxides is:


A

Al[OH]3,LiOH

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B

Be[OH]2,Mg[OH]2

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C

B[OH]2,Be[OH]2

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D

Be[OH]2,Zn[OH]2

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Solution

The correct option is D

Be[OH]2,Zn[OH]2


Explanation for the correct option:

[D]Be[OH]2,Zn[OH]2

  • Metals give Basic hydroxides whereas, non-metals give Acidic hydroxides.
  • Metals with electropositive nature give Amphoteric hydroxides which act as both acid and a base.
  • Be,Znare both metals with electropositive nature.
  • So, they will form Amphoteric oxides which act as the base with acid and as a base with acid causing neutralization.

So, option[D] is correct.

Explanation for the Incorrect options:

[A]Al[OH]3,LiOH

  • Here, Al [Aluminum] metal forms Amphoteric hydroxide due to its electropositive nature.
  • But,Li [Lithium] acts as a metal forming the Basic hydroxide.
  • Only one of them is amphoteric.

So, option[A] is incorrect.

[B]Be[OH]2,Mg[OH]2

  • Here, Be[Beryllium] metal forms Amphoteric hydroxide due to its electropositive nature.
  • But, Mg[Magnesium] acts as a metal forming the Basic hydroxide.
  • Only one of them is amphoteric.

So, option[B] is incorrect.

[C]B[OH]2,Be[OH]2

  • Here, Be[Beryllium] metal forms Amphoteric hydroxide due to its electropositive nature.
  • But, B[Boron] acts as a non-metal forming the Acidic hydroxide.
  • Only one of them is amphoteric.

So, option[C] is incorrect.

Hence, option[D] has both Amphoteric hydroxides.


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