In oxidation reactions, electrons are

Analysis

The question asks for the definition of oxidation in terms of electron transfer. This is a fundamental concept in electrochemistry and redox reactions, which are common topics in the JAMB Chemistry syllabus.

Concept: OIL RIG

To understand oxidation and reduction, we use the mnemonic OIL RIG:

• Oxidation Is Loss (of electrons)
• Reduction Is Gain (of electrons)

In any chemical reaction where electrons are transferred, the substance that loses electrons is said to be oxidized, while the substance that gains electrons is said to be reduced.

Step-by-Step Solution

1. Define Oxidation: Oxidation is defined as the loss of electrons from an atom, molecule, or ion.
2. Evaluate the options: • A. Hydrolysed: This refers to a reaction involving water (splitting a compound using water). This is not related to electron transfer. • B. Removed: Since oxidation is the loss of electrons, the electrons are effectively being taken away or removed from the species. • C. Added: This describes reduction (the gain of electrons). • D. Hydrated: This refers to the addition of water molecules to a substance.

Since oxidation involves the loss of electrons, those electrons are removed from the substance undergoing oxidation.

Conclusion

Exam Tip: Always remember that oxidation and reduction must happen together. If one substance loses electrons (is oxidized), another must gain them (is reduced). You can never have one without the other!