Question:

In the following sets of reactants which two sets best exhibit the amphoteric characters of $ {Al_2O_3. xH_2O}$ ? Set 1: $ {Al2O3.xH2O (s)}$ and $ {OH- (aq)}$ Set 2: $ {Al2O3.xH2O (s)}$ and $ {H2O (l)}$ Set 3: $ {Al2O3.xH2O (s)}$ and $ {H+ (aq)}$ Set 4: $ {Al2O3.xH2O (s)}$ and $ {NH3 (aq)}$

Updated On: Jul 6, 2022
  • 1 and 2
  • 1 and 3
  • 2 and 4
  • 3 and 4
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The Correct Option is B

Solution and Explanation

Aluminium oxide is amphoteric oxide because it shows the properties of the both acidic and basic oxides. It reacts with both acids and bases to form salt and water. $ {Al2O3. xH2O + 2NaOH -> NaAlO2 + H2O}$ $ {Al2O3. xH2O + HCl -> AlCl3 + H2O }$
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Top Questions on p -Block Elements

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Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: