Please explain oxidation and reduction in terms of loss or gain of electrons with examples

Asked by Trisha Gupta | 24th Sep, 2021, 03:04: PM

Expert Answer:

  • Oxidation is the loss of electrons and reduction is the gain of electrons.
  • To explain the involvement of oxidation and reduction in the formation of molecular compounds, the concept of oxidation number was introduced.

Example: Hydrogen combining with oxygen to form water.

 2 straight H subscript 2 space left parenthesis straight g right parenthesis space space plus space space straight O subscript 2 space left parenthesis straight g right parenthesis space space space rightwards arrow with blank on top space space 2 straight H subscript 2 straight O space left parenthesis straight l right parenthesis

  • In the formation of water, electron transfer is realised when hydrogen combines with oxygen.
  • The hydrogen atom (H) goes from a neutral state, i.e. a zero state (H2) to a positive state in H2O, whereas the oxygen atom (O) goes from a neutral state, i.e. a zero state (O2) to a dinegative state in H2O.
  • It is assumed that there is an electron transfer from H to O, and consequently, H2 is oxidised and O2 is reduced.
  • The transfer of the charge is partial and considered an electron shift rather than a complete loss of electrons by hydrogen (H) and gain of electrons by oxygen (O).

Example:

      stack 2 straight H subscript 2 with 0 on top space left parenthesis straight g right parenthesis space space plus space space stack straight O subscript 2 with 0 on top space left parenthesis straight g right parenthesis space space space rightwards arrow with blank on top space space 2 stack straight H subscript 2 space space end subscript with plus 1 on top straight O with negative 2 on top space left parenthesis straight l right parenthesis

 

 

     

 

 

 

 

     

Answered by Ramandeep | 24th Sep, 2021, 05:21: PM

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