The green colour of Fe^2+ changes to brown Fe^3+ by

The green colour of Fe^2+ changes to brown Fe^3+ by 

A. substitution

B. oxidation

C. reduction

D. conversion

From the acronium LEO GER

Lost Of Electron=Oxidation

Gain Of Electron=Reduction

When Fe²⁺ (green) changes to Fe³⁺ (brown), it loses an electron.

Loss of electrons is called oxidation.

✅ Correct answer: B. oxidation

Exam tip:

• Oxidation: loss of electrons

• Reduction: gain of electrons

• Green → brown in iron ions is a classic oxidation example.

• PQN: 26