8th Class Science Sample Paper Science Sample Paper-2

  • question_answer 27)                                     How are acids and bases formed?    

    Answer:

           

    Acids: Acids are formed when non-metals react with oxygen and form non-metallic oxides. These oxides when dissolved in water, form acids. e.g.,
    \[\begin{align}   & \,\,\,\,\,\,\,S\,\,\,\,\,\,\,\,+\,\,\,\,\,\,\,{{O}_{2}}\,\,\,\,\,\,\,\to \,\,\,\,\,\,\,\,\,\,\,S{{O}_{2}} \\  & Sulphur\,\,\,Oxygen\,\,\,\,\,\,\,Sulphur\,dioxide\, \\ \end{align}\]
    \[\begin{align}   & \,\,\,\,\,\,\,\,\,\,\,\,\,S{{O}_{2\,\,}}\,\,\,\,\,\,\,\,\,\,\,\,\,+\,\,\,{{H}_{2}}O\,\,\,\to \,\,\,\,\,\,\,\,\,{{H}_{2}}S{{O}_{3}} \\  & Sulphure\,dioxide\,\,\,\,Water\,\,\,\,\,\,\,Sulphirous\,acid \\ \end{align}\]
    Bases: Bases are formed when metals react with oxygen and form metallic oxides. These oxides when dissolved in water, form bases. e.g.
    \[\begin{align}   & \,\,\,\,2Na\,\,\,\,+\,\,\,\,\,\,\,{{O}_{2}}\,\,\,\,\,\,\to \,\,\,\,\,\,\,\,\,\,\,N{{a}_{2}}O \\  & Sodium\,\,\,\,Oxygen\,\,\,\,\,\,\,Sodium\,\,oxide \\ \end{align}\]
    \[\begin{align}   & \,\,\,\,\,\,N{{a}_{2}}O\,\,\,\,\,\,\,\,\,\,\,+\,\,\,{{H}_{2}}O\,\,\to \,\,\,\,\,\,\,\,\,\,2NaOH \\  & Sodium\,oxide\,\,\,\,Water\,\,\,\,\,\,Sodiumhydroxide \\ \end{align}\]


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