Q. How many of the following statements refer to 'reduction'?
i. Removal of oxygen
ii. Addition of electropositive element
iii. Removal of hydrogen
iv. Loss of electrons
v. Addition of electronegative element
vi. Gain of electrons
vii. Oxidation number of the element increases

 102  154 Redox Reactions Report Error

Answer: 3

Solution:

Statements , and represent reduction.