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Q: In oxidation-reduction change in __________ of reacting element takes place.
  • A. Volume
  • B. pH
  • C. Absorbance
  • D. Valency
Correct Answer: Option D - In oxidation-reduction (redox) reaction, the valency (or oxidation state) of the reacting elements change due to the transfer of electrons between them. This change in valency defines the process of oxidation (loss of electrons) and reduction (gain of electrons).
D. In oxidation-reduction (redox) reaction, the valency (or oxidation state) of the reacting elements change due to the transfer of electrons between them. This change in valency defines the process of oxidation (loss of electrons) and reduction (gain of electrons).

Explanations:

In oxidation-reduction (redox) reaction, the valency (or oxidation state) of the reacting elements change due to the transfer of electrons between them. This change in valency defines the process of oxidation (loss of electrons) and reduction (gain of electrons).