Question

Oxidation can involve

• A. Addition of oxygen
• B. Removal of Hydrogen
• C. Removal of electropositive element
• D. Addition of electronegative element

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Addition of oxygen
B Removal of Hydrogen
C Removal of electropositive element
D Addition of electronegative element

As the name suggest,
Oxidation $\to$ Addition of oxygen
In general,
Oxidation is the process of addition of oxygen or any electronegative element or group or removal of hydrogen or any electropositive element or group.
For example:
a. $2Mg\left(s\right)+O_2\left(g\right)\stackrel{\left[0\right]}{\to }2MgO\left(s\right)\left(Additionofoxygen\right)$
b. $2FeC{l}_2\left(aq\right)+C{l}_2\left(g\right)\stackrel{\left[0\right]}{\to }3FeC{l}_3\left(aq\right)$
(Addition of electronegative element)
c. $H_{2}S\left(g\right)+C{l}_2\left(g\right)\stackrel{\left[0\right]}{\to }2HCl\left(g\right)+S\left(s\right)$
(Removal of hydrogen)
d. $K_{2}Mn{O}_4\left(aq\right)+O_3\left(g\right)+H_{2}O\left(1\right)\stackrel{\left[0\right]}{\to }KMn{O}_4\left(aq\right)+KOH\left(aq\right)$
(Removal of electropositive element)
A more general definition is:
Oxidation: It is a process in which an atom or a group of atoms taking part in a chemical reaction loses one of more electrons.