Covers the three main types of redox reactions—combination, decomposition, and displacement—with definitions and examples to clarify how electrons are transferred in each case.
Let S = x. O = -2. Equation: 2x + 3(-2) = -2, 2x - 6 = -2, 2x = 4, x = +2 (average).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
O (-2 in H₂O) becomes 0 in O₂, losing electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
F (0 in F₂) becomes -1 in SF₄ and HF, gaining electrons; S (-2 to +4) is oxidized.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
HNO₃ (N: +5) is reduced to NO (N: +2), oxidizing Sn (0 to +4).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
In C + O₂ → CO₂, C (0) is oxidized to +4, and O₂ (0) is reduced to -2, making it a redox combination reaction.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
In 2Ag₂O → 4Ag + O₂, Ag (+1) is reduced to 0, and O (-2) is oxidized to 0.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
In MgSO₄ + 2NaOH → Mg(OH)2 + Na₂SO₄, no element changes oxidation state; it’s a double displacement reaction.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
Reduction involves electron gain. O (0 in O₂) becomes -1 in H₂ (via intermediate steps), gaining electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
Let W = x. O = -2. Equation: x + 3(-2) = 0, x - 6 = 0, x = +6.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
The oxidizing agent is reduced. Cu (+2 in CuSO₄) becomes 0 in Cu, oxidizing Cr (0 to +3).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
Br (-1 in KBr) to 0 in Br₂: +1. Mn (+4 in MnO₂) to +2: -2. Br increases, Mn decreases; Br has the largest increase.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
In 2H₂O₂ → 2H₂O + O₂, O (-1 in H₂O₂) becomes -2 in H₂O and 0 in O₂, indicating disproportionation.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
