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1)name the elements whose oxides are amphoteric in nature 2)name the elements whose hydroxides are amphoteric in nature 3)how to find out whether oxide or hydroxide of a given element is amphoteric in nature or not 4)Assertion and reason IIT JEE 2012 que assertion:Al(OH) 3 is amphoteric in nature. reason:Al—O and O—H bonds can be broken with equal case in Al(OH) 3 . (A)if assertion and reason both are right and reason is correct explanation of assertion (B)if assertion and reason both are but reason is not correct explanation of assertion (C)if assertion is right but reason is wrong (D)if assertion is wrong reason is right ans-C i need explanation of all above.. please help...

1)name the elements whose oxides are amphoteric in nature


2)name the elements whose hydroxides are amphoteric in nature


3)how to find out whether oxide or hydroxide of a given element is amphoteric in nature or not


4)Assertion and reason IIT JEE 2012 que


assertion:Al(OH)3 is amphoteric in nature.


reason:Al—O and O—H bonds can be broken with equal case in Al(OH)3.


(A)if assertion and reason both are right and reason is correct explanation of assertion


(B)if assertion and reason both are but reason is not correct explanation of assertion


(C)if assertion is right but reason is wrong


(D)if assertion is wrong reason is right


ans-C


i need explanation of all above..


please help...

Grade:12th Pass

1 Answers

ruchi yadav
askIITians Faculty 27 Points
10 years ago

Zinc oxide(ZnO) reacts with both acids and with bases:

  • In acid: ZnO + 2H+? Zn2++ H2O
  • In base: ZnO + H2O + 2 OH-? [Zn(OH)4]2-

This reactivity can be used to separate differentcations, such as zinc(II), which dissolves in base, from manganese(II), which does not dissolve in base.

Aluminium hydroxideis also amphoteric:

  • As a base (neutralizing an acid): Al(OH)3+ 3 HCl ? AlCl3+ 3 H2O
  • As an acid (neutralizing a base): Al(OH)3+ NaOH ? Na[Al(OH)4]

Some other amphoteric compounds include:

  • Beryllium hydroxide
    • with acid: Be(OH)2+ 2 HCl ? BeCl2+ 2 H2O
    • with base: Be(OH)2+ 2 NaOH ? Na2[Be(OH)4]
  • Aluminium oxide
    • with acid: Al2O3+ 3 H2O + 6 H3O+(aq) ? 2 [Al(H2O)6]3+(aq)
    • with base: Al2O3+ 3 H2O + 2 OH-(aq) ? 2 [Al(OH)4]-(aq)
  • Lead(II) oxide
    • with acid: PbO + 2 HCl ? PbCl2+ H2O
    • with base: PbO + 2 NaOH + H2O ? Na2[Pb(OH)4]

Thank You
Ruchi
Askiitians Faculty

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