Class 11 Chemistry - ODISHA
Redox Reactions
The Redox Reactions chapter in Class 11 Chemistry under the Odisha BSE board explores oxidation and reduction processes happening simultaneously. Students learn about classical and electronic concepts of oxidation and reduction, oxidation number calculation, balancing redox equations using ion-electron and oxidation number methods, and redox reactions as the basis for electrochemistry. This chapter is vital for board exams as it forms the foundation for quantitative analysis, volumetric titrations, and advanced physical chemistry chapters in Class 12, frequently appearing in both short-answer and numerical problems.
Start Learning FreeKey Concepts
Classical Concept of Oxidation and Reduction
Oxidation is defined as the addition of oxygen or electronegative elements, or removal of hydrogen or electropositive elements. Reduction is the exact opposite process.
Electronic Concept
Oxidation involves the loss of electrons (increase in oxidation state), while reduction involves the gain of electrons (decrease in oxidation state).
Oxidation Number
It is a fictitious or apparent charge assigned to an atom in a molecule or ion based on a set of arbitrary rules, which helps track electron shifts.
Oxidizing and Reducing Agents
An oxidizing agent (oxidant) accepts electrons and gets reduced itself, whereas a reducing agent (reductant) donates electrons and gets oxidized itself.
Balancing Redox Equations
Equations for redox reactions are balanced using either the oxidation number method or the ion-electron (half-reaction) method in acidic and basic media.
Important Formulas
Board Exam Info
In the Odisha BSE Class 11 Chemistry examination, Redox Reactions typically carries around 4 to 6 marks. Questions usually include conceptual definitions, calculating oxidation numbers of specific elements, identifying oxidizing and reducing agents, and numerical problems on balancing chemical equations.
Frequently Asked Questions
What is the difference between valency and oxidation number?
Valency is a combining capacity and is always a whole number without any positive or negative sign. Oxidation number represents the charge an atom appears to have and can be positive, negative, zero, or even fractional.
How can I easily calculate the oxidation number of an element?
Use standard rules such as assigning -2 to oxygen (with some exceptions like peroxides), +1 to hydrogen (except in metal hydrides), and setting the sum of oxidation numbers in a neutral compound to zero.
Why is it called a redox reaction?
The term 'redox' is a portmanteau of reduction and oxidation. It is called so because reduction and oxidation always occur simultaneously in a chemical reaction; one species cannot lose electrons unless another species accepts them.
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