Question

Oxidation is a reaction in which there is

• A. Dissociation of hydrogen
• B. Loss of electrons
• C. Addition of oxygen
• D. All of these

Hint:

Remember: Oxidation and reduction always occur together. If one substance is oxidized, another is reduced.

Answer 1

The Correct Option is D

Step 1: Conceptual Background:
Oxidation is one of the fundamental concepts in chemistry, and its definition has evolved over time:
Classical definition: Oxidation means the addition of oxygen or the removal of hydrogen.
Modern definition: Oxidation refers to the loss of electrons.
It is always coupled with reduction (gain of electrons) in a redox reaction.
Step 2: Analysis of Options:
(A) Dissociation/removal of hydrogen $\rightarrow$ Yes, this is oxidation.
(B) Loss of electrons $\rightarrow$ Yes, modern definition of oxidation.
(C) Addition of oxygen $\rightarrow$ Yes, classical definition.
(D) All of these $\rightarrow$ Since all above are valid, this is correct.
Step 3: Example:
\[ 2Mg + O_2 \rightarrow 2MgO \] Here, magnesium undergoes oxidation as it loses electrons and combines with oxygen.
Step 4: Final Answer:
Oxidation can involve loss of hydrogen, loss of electrons, or addition of oxygen, so the correct answer is All of these.