Chemistry
Grade-10
Easy
Question
Which of the following is NOT an example of an oxidation-reduction reaction?
- Metal rusting
- Acid neutralizing base
- Burning methane
- Photosynthesis
Hint:
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 + O2 
Fe2O3 ; Fe is oxidized and O is reduced, it is a redox reaction.
Acid neutralizing base
NaOH + HCl NaCl + H2O ; Not a redox reaction.
Burning methane
CH4 + O2 CO2 + H2O ; Oxygen is reduced.
Photosynthesis
6CO2 + 6H2O C6H12O6 + 6O2 ; Oxygen is oxidized
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