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In a redox reaction, reduction can be described as:
loss of electrons
addition of hydrogen
addition of an electronegative element
addition of oxygen
addition of hydrogen
In chemistry, reduction is defined as the addition of hydrogen to a substance, the removal of oxygen from a substance, or the gain of electrons.
In chemistry, reduction is defined as the addition of hydrogen to a substance, the removal of oxygen from a substance, or the gain of electrons.
Think of reduction like a 'collector' gaining items (electrons or hydrogen atoms), while oxidation is like a 'donor' giving items away.
OIL RIG: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons).
Cu2++2eтИТтЖТCu тАФ Gain of electrons (Reduction)
CH2тАЛ=CH2тАЛ+H2тАЛтЖТCH3тАЛтИТCH3тАЛ тАФ Addition of hydrogen (Reduction)
Redox reactions involve the transfer of electrons between two species. Reduction occurs when an atom or molecule gains electrons (decreasing its oxidation state), accepts hydrogen atoms, or loses oxygen atoms. Conversely, oxidation is the loss of electrons or gain of oxygen.
Reduction involves a decrease in oxidation state.
Addition of an electronegative element is actually a form of oxidation, not reduction.
In terms of electrons, reduction is 'Gain'.
In terms of oxygen, reduction is 'Loss'.
Fundamental for understanding energy metabolism in biological systems (e.g., cellular respiration).
Extraction of metals from their ores.
Hydrogenation of vegetable oils.
| Feature | Oxidation | Reduction |
|---|---|---|
Electronic Concept | Loss of electrons | Gain of electrons |
Addition of an electronegative element (Option C) is a hallmark of oxidation, not reduction.
Addition of oxygen (Option D) is the definition of oxidation.
The term 'Redox' is a portmanteau of Reduction and Oxidation.
B is correct тАФ Reduction is classically defined in chemistry as the addition of hydrogen or the removal of oxygen.
Always remember the mnemonic 'OIL RIG'. If you see 'Gain of Hydrogen', think 'Reduction', as Hydrogen (being less electronegative) often 'donates' its electron density to the other reactant.
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