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Revision Notes for Class 11 Chemistry Chapter 8 Redox Reactions
Class 11 Chemistry students should refer to the following concepts and notes for Chapter 8 Redox Reactions in Class 11. These exam notes for Class 11 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks
Chapter 8 Redox Reactions Notes Class 11 Chemistry
Oxidation number denotes theoxidation state of an element in a compound ascertained according to a setof rules formulated on the basis thatelectron in a covalent bond belongsentirely to more electronegative element.
Calculation of oxidation number-
1. O. S. of all the elements in their elemental form (in standard state) is taken as zero O. S. of elements in Cl2, F2, O2, P4, O3, Fe(s), H2, N2, C(graphite) is zero.
2. Common O. S. of elements of group one (1st) is one. Common O. S. of elements of group two (2nd) is two.
3. For ions composed of only one atom, theoxidation number is equal to the chargeon the ion.
4. The oxidation number of oxygen in most compounds is –2.While in peroxides (e.g., H2O2, Na2O2), eachoxygen atom is assigned an oxidationnumber of –1, in superoxides (e.g., KO2,RbO2) each oxygen atom is assigned anoxidation number of –(½).
5. In oxygendifluoride (OF2) and dioxygendifluoride (O2F2), the oxygen is assignedan oxidation number of +2 and +1,respectively.
6. The oxidation number of hydrogen is +1 but in metal hydride its oxidation no. is–1.
7. In all its compounds, fluorine has anoxidation number of –1.
8. The algebraic sum of the oxidation numberof all the atoms in a compound must bezero.
9. In polyatomic ion, the algebraic sumof all the oxidation numbers of atoms ofthe ion must equal the charge on the ion.
Stocknotation: the oxidationnumber is expressed by putting a Romannumeral representing the oxidation numberin parenthesis after the symbol of the metal inthe molecular formula. Thus aurous chlorideand auric chloride are written as Au(I)Cl andAu(III)Cl3. Similarly, stannous chloride andstannic chloride are written as Sn(II)Cl2andSn(IV)Cl4.
Oxidation: An increase in the oxidationnumber
Reduction: A decrease in the oxidationnumber
Oxidising agent: A reagent which canincrease the oxidation number of an elementin a given substance. These reagents are calledas oxidants also.
Reducing agent: A reagent which lowers the oxidation number of an element in a givensubstance. These reagents are also called asreductants.
Redox reactions: Reactions which involvechange in oxidation number of the interactingspecies.
Balancing of redox reactions: Oxidation Number Method: Write the net ionic equation for the reaction of potassium dichromate(VI), K2Cr2O7 with sodium sulphite,Na2SO3, in an acid solution to give chromium(III) ion and the sulphate ion.
Please click the link below to download pdf file for CBSE Class XI Chemistry Redox Reactions Concepts.
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CBSE Class 11 Chemistry Chapter 8 Redox Reactions Notes
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Notes for Chemistry CBSE Class 11 Chapter 8 Redox Reactions
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Chapter 8 Redox Reactions Notes for Chemistry CBSE Class 11
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Chapter 8 Redox Reactions CBSE Class 11 Chemistry Notes
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Notes for CBSE Chemistry Class 11 Chapter 8 Redox Reactions
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