The process in which oxidation number decreases is known as:
- Areduction
- Boxidation
- Credox reaction
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (a) reduction
Explanation
Reduction is a decrease in oxidation number, which happens when a substance gains electrons. Oxidation is an increase in oxidation number (loss of electrons).
For example, in CuO + H₂ → Cu + H₂O copper goes from +2 to 0 (reduced) while hydrogen goes from 0 to +1 (oxidised). A redox reaction is one where both happen together.