Flashcards for NEET Chemistry - Redox Reactions

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Chemistry

Redox Reactions

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Redox Reactions

Oxidation

Addition of oxygen/electronegative element to a substance or removal of hydrogen/electropositive element from a substance

Loss of electron(s) by any species

Reduction

Removal of oxygen/electronegative element from a substance or addition of hydrogen/electropositive element to a substance

Gain of electron(s) by any species

Redox Reactions

Oxidation and reduction always occur simultaneously, e.g.

H₂S_(g) + Cl_2(g) → 2 HCl_(g) + S_(s), here, H₂S is oxidised and chlorine is reduced

2 Na_(s) + H_2(g) → 2 NaH_(s), here, sodium is oxidised and hydrogen is reduced

Disproportionation Reactions

It is a reaction in which an element is simultaneously oxidised and reduced, e.g.

2 H₂O_2(aq) → 2 H₂O_(l) + O_2(g)

Here, the oxygen of peroxide is in –1 state and it is oxidised to zero oxidation state in O₂ and reduced to – 2 oxidation state in H₂O.

Redox Couple

The oxidised and reduced forms of a substance taking part in an oxidation or reduction half reaction, e.g.

Zn²⁺/Zn (oxidation)

Cu²⁺/Cu (reduction)

Intramolecular Redox Reactions

Here, one element of a compound is oxidised while the other is reduced, e.g.

2 KClO₃ → 2 KCl + 3 O₂

Here, oxygen is oxidised and chlorine is reduced

Oxidising Agents (Oxidants)

A species, which oxidises others but itself gets reduced

Acceptor of electron(s)

Reducing Agents (Reductants)

A species, which reduces others but itself gets oxidised

Donor of electron(s)

Oxidation Number

It is the residual charge (±) present on an atom in a compound when the shared electrons in a covalent bond belong entirely to a more electronegative element

Also Check:

• NEET Chemistry Syllabus
• NEET Chemistry Important Topics
• NEET Chemistry MCQs
• How to Score 160 Plus in NEET Chemistry