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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Third Row Elements Page 4

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9

Acidic and Basic Characterstics of Oxides

 

An oxide is a binary compound of an element with oxygen. Oxides of the third row elements are classified into three classes - basic, acidic and amphoteric oxides.

  • Basic oxides
    Basic oxides react with water to produce bases and react with acids to produce salt and water. Oxides of metals are basic in nature. Na2O is more basic than MgO.

Na2O + H2O ® 2NaOH

Na2O + 2HCl ® 2NaCl + H2O

MgO + H2O ® Mg(OH)2

MgO + 2HCl ® MgCl2 + H2O

  • Acidic oxides
    Acidic oxides react with water to produce acids and react with bases to produce salt and water. Oxides of non-metals of the third row elements are acidic in nature.

SiO2 + 2H2O ® Si(OH)4 or

H4SiO4

 

orthosilicic acid

SiO2 + 2NaOH ®

Na2SiO3 + H2O

 

sodium silicate

P2O5 + 3H2O   ®

2H3PO4

 

phosphoric acid

P2O5 + 6NaOH ®

2Na3PO4 + 6H2O

 

sodium phosphate

SO3 + H2O ®

H2SO4

 

sulphuric acid

SO3 + 2NaOH ®

Na2SO4 + H2O

 

sodium sulphate

Cl2O7 + H2O ®

2HClO4

 

perchloric acid

Cl2O7 + 2NaOH ®

2NaClO4 + H2O

 

sodium perchlorate

  •  
  • Amphoteric Oxides

Oxides that react with acids and bases to produce salt and water are called amphoteric oxides. Among the third row elements, aluminium oxide is amphoteric in nature.

Al2O3 + 6HCl ® 2AlCl3 + 3H2O

Al2O3 + 2NaOH ® 2NaAlO2 + H2O
                           (sodium meta aluminate)

In the third row elements, the basicity of the oxides decreases and the acidity increases from sodium to chlorine; sodium oxide is the strongest basic oxide, while chlorine oxide is the strongest acidic oxide.

 

 

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