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,
$\text{Oxidation}\to \text{Addition of oxygen}$
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. $2Mg\left(s\right)+O_2\left(g\right)\stackrel{\left[0\right]}{\to }2MgO\left(s\right)$
(Addition of oxygen)
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.