11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 84)     p-block elements form acidic, basic and amphoteric oxides. Explain each property by giving two examples also write the reactions of these oxides with water.

    Answer:

      p-block elements form acidic, basic and amphoteric oxides. C, N, P, S, Cl, etc. (i.e., p-block elements) form acidic oxides. They combine with water to form oxyacids. \[C{{O}_{2}}+{{H}_{2}}O\to \underset{\text{Carbonic}\,\text{acid}}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,\] \[{{N}_{2}}{{O}_{5}}+{{H}_{2}}O\to \underset{Nitric\,acid}{\mathop{2HN{{O}_{3}}}}\,\] \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\to \underset{Orthophosphoric\,acid}{\mathop{2{{H}_{3}}P{{O}_{4}}}}\,\] \[S{{O}_{3}}+{{H}_{2}}O\to \underset{Sulphuric\,acid}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\] \[C{{l}_{2}}{{O}_{7}}+{{H}_{2}}O\to \underset{Perchloric\,acid}{\mathop{2HCl{{O}_{4}}}}\,\] Al, Sb, Pb, etc. (i.e., p-block elements) form amphoteric oxides. These oxides react with acids and bases both. \[A{{1}_{2}}{{O}_{3}}\text{ }+6HCl\to \text{ }2A1C{{1}_{3}}\text{ }+3{{H}_{2}}O\] \[A{{l}_{2}}{{O}_{3}}+2NaOH\to 2NaAl{{O}_{2}}+{{H}_{2}}O\] \[S{{b}_{2}}{{O}_{3}}\text{ }+6HCl\text{ }\to \text{ }2SbC{{l}_{3}}\text{ }+3{{H}_{2}}O\] \[S{{b}_{2}}{{O}_{3}}+6NaOH\to \text{ }N{{a}_{3}}Sb{{O}_{3}}+3{{H}_{2}}O\] \[PbO+{{H}_{2}}S{{O}_{4}}\text{ }\to \text{ }PbS{{O}_{4}}\text{ }+{{H}_{2}}O\] \[PbO+\text{ }2NaOH\to \text{ }N{{a}_{2}}Pb{{O}_{2}}\text{ }+\text{ }{{H}_{2}}O\] The oxides of In and Tl (p-block elements) form basic oxides. \[I{{n}_{2}}{{O}_{3}}+3{{H}_{2}}S{{O}_{4}}\to I{{n}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}+3{{H}_{2}}O\] \[\text{T}{{\text{1}}_{\text{2}}}\text{O + }{{\text{H}}_{\text{2}}}\text{O}\to \text{2T1OH}\] \[T{{l}_{2}}{{O}_{3}}\text{ }+3{{H}_{2}}S{{O}_{4}}\text{ }\to \text{ }T{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}+3{{H}_{2}}O\]

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