#oxidation number

CHEMISTRY

What is the oxidation number of oxygen in OF₂ ?

In OF₂, F is -1 (more electronegative), sum is zero: x + 2(-1) = 0, x - 2 = 0, x = +2 . This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

View Details

Isomerism - Optical Isomerism and Linkage Ionisation Solvate

What is the oxidation state of iron in [Fe(H₂O)4Cl₂]?

In [Fe(H₂O)4Cl₂], H₂O is neutral, each Cl− is −1. The complex is neutral, so x + 0 + 2(−1) = 0, x = +2.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate

View Details

Isomerism - Optical Isomerism and Linkage Ionisation Solvate

What is the oxidation state of manganese in [Mn(CN)6]4−?

In [Mn(CN)6]4−, each CN− is −1, totaling −6 for 6 ligands. The overall charge is −4. Thus, x + (−6) = −4, so x = +2.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate

View Details

Types of Redox Reactions - Combination Decomposition Displacement

What is the oxidation number of sulfur in S₂O₃²⁻?

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

View Details

Types of Redox Reactions - Combination Decomposition Displacement

What is the oxidation number of iodine in IF₇?

Let I = x. F = -1. Equation: x + 7(-1) = 0, x - 7 = 0, x = +7.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement

View Details

Redox Titrations and Equivalent Weight and Normality

What is the oxidation number of chlorine in Cl₂O₇?

Let Cl = x. O = -2. Equation: 2x + 7(-2) = 0, 2x - 14 = 0, x = +7.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Redox Titrations and Equivalent Weight and Normality

What is the oxidation number of carbon in CH₃Cl?

Let C = x. H = +1, Cl = -1. Equation: x + 3(+1) + (-1) = 0, x + 3 - 1 = 0, x = -2.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Redox Titrations and Equivalent Weight and Normality

What is the oxidation number of phosphorus in P₂O₅?

Let P = x. O = -2. Equation: 2x + 5(-2) = 0, 2x - 10 = 0, x = +5.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Redox Titrations and Equivalent Weight and Normality

In 2Ag₂O + C → 4Ag + CO₂, which element’s oxidation number changes by the largest magnitude?

Ag (+1 to 0): change = -1. C (0 to +4 in CO₂): change = +4. C has the largest magnitude change.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Redox Titrations and Equivalent Weight and Normality

What is the oxidation number of tellurium in TeO₃²⁻?

Let Te = x. O = -2. Equation: x + 3(-2) = -2, x - 6 = -2, x = +4.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Redox Titrations and Equivalent Weight and Normality

Which element shows a fractional oxidation state in FeS₂?

In FeS₂ (pyrite), Fe = +2, and S₂ acts as a peroxide-like unit with S = -1 (average). Sulfur’s state is fractional in context.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

View Details

Oxidizing and Reducing Agents and Strength

What is the oxidation number of niobium in NbCl₅?

Let Nb = x. Cl = -1. Equation: x + 5(-1) = 0, x - 5 = 0, x = +5.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength

View Details