Latest questions in this category.
I (-1 in KI) becomes 0 in I₂, losing electrons; Cu (+2 to +1) is reduced.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
As (0 to +3 in As₂S₃): 2 As lose 6 electrons total. Per As = 6/2 = 3 electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
Let Sb = x. F = -1. Equation: x + 5(-1) = 0, x - 5 = 0, x = +5.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
N (+5 in NaNO₃) to +3 in NaNO₂: 2 N gain 4 electrons total. Per NaNO₃ = 4/2 = 2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
Let P = x. Cl = -1. Equation: x + 3(-1) = 0, x - 3 = 0, x = +3.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
In metal hydrides, H has an oxidation number of -1. For NaH: Na = +1, so +1 + x = 0, x = -1.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
S (+4 in SO₂) remains +4 in H₂SO₃. Change = 0 (not a redox reaction).
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
V (+3 in VCl₃) to +4 in VCl₄: change = +4 - (+3) = +1; each V loses 1 electron.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
C in CH₄: -4. In CHCl₃: x + 1 + 3(-1) = 0, x - 2 = 0, x = +2, which is higher.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
In superoxides, O has an oxidation number of -1/2. For KO₂: K = +1, so +1 + 2x = 0, 2x = -1, x = -1/2.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
N (0 in N₂) becomes -3 in NH₃. Change = -3 - 0 = -3.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
As (+3 in As₂S₃) to +5 in H₃AsO₄: change = +2. S (-2 in As₂S₃) to +6 in H₂SO₄: change = +8. S increases more.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
