Define reduction in terms of loss or gain of oxygen or hydrogen. Give an example.

Reduction refers to the process in which an atom, ion, or molecule gains electrons, or loses oxygen or gains hydrogen. An example is the reduction of copper(II) oxide (CuO) by hydrogen:

CuO+H2→Cu+H2O
In this case, copper oxide gains hydrogen and loses oxygen, resulting in the formation of copper metal.

Related Questions:

  1. Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O
  2. Which salt is formed when HCl reacts with BaCO₃?
  3. How will you justify that H₂SO₄ is a Bronsted-Lowry acid?
  4. Define oxidation in terms of electrons. Give an example.
  5. What is the difference between valency and oxidation state?
  6. Differentiate between oxidizing and reducing agents.
  7. Differentiate between strong and weak electrolytes.
  8. How is electroplating of tin on steel carried out?
  9. Why is steel plated with nickel before the electroplating of chromium?
  10. How can you explain that the following reaction is oxidation in terms of increase of oxidation number?
  11. How can you prove with an example that conversion of an ion to an atom is an oxidation process?
  12. Why does the anode carry a negative charge in a galvanic cell but a positive charge in an electrolytic cell? Justify with comments.
  13. Where do the electrons flow from the Zn electrode in Daniel’s cell?
  14. What happens at the cathode in a galvanic cell?
  15. Which solution is used as an electrolyte in Nelson’s cell?
  16. Name the by-products produced in Nelson’s cell.
  17. Why is galvanizing done?
  18. Why is an iron grill painted frequently?
  19. Why is O₂ necessary for rusting?
  20. In electroplating of chromium, which salt is used as an electrolyte?