Chemistry
Grade-10
Easy

Question

Which of the following is NOT an example of an oxidation-reduction reaction?

  1. Metal rusting
  2. Acid neutralizing base
  3. Burning methane
  4. Photosynthesis

hintHint:

Reduction-oxidation means the reaction undergoes either one.

The correct answer is: Acid neutralizing base


    The term redox refers to the reduction-oxidation process.
    Metal rusting

    Fe + O rightwards arrow Fe2O3 ; Fe is oxidized and O is reduced, it is a redox reaction.
    Acid neutralizing base
    NaOH + HCl rightwards arrow NaCl + H2O ; Not a redox reaction.
    Burning methane
    CH4 + O2 rightwards arrow CO2 + H2O ; Oxygen is reduced.
    Photosynthesis
    6CO+ 6H2rightwards arrow C6H12O6  + 6O2 ; Oxygen is oxidized

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