During redox reactions:

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In redox chemistry, we assess what happens to electrons during the reaction. 
Option 1: 'A substance that gains electrons is said to be oxidized.' This is incorrect because gaining electrons is the definition of reduction, not oxidation. Oxidation refers to loss of electrons. 
Option 2: 'A substance always gains a molecule of oxygen.' This is a common misconception. Although some oxidations involve oxygen, oxidation-reduction does not require an oxygen molecule to be gained; electrons can be transferred without an oxygen molecule being involved. 
Option 3: 'Protons from one molecule replace the electrons lost from another.' Protons are not the agents that replace electrons in redox processes; electrons are transferred between species, while protons may be involved in balancing charges in the surrounding medium, but they are not the defining mechanism of electron transfer in redox. 
Option 4: 'The loss of electrons from one substance is called reduction.' This is the reverse of the correct concept. The loss of electrons is oxidation, while reduction is the gain of electrons. 
Option 5: 'Electrons are lost from one substance and added to another substance.' This statement captures the essential idea of a redox reaction: electron transfer from the reducing substance (which is oxidized) to the oxidizing substance (which is reduced). It correctly describes the core process of redox chemistry.

Dashboard TEST 1 2025 T3

During redox reactions:

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