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Chemistry formula for class 11 chapter- Redox Reactions

Chemistry Formulas

Class 11 chapter- Redox Reactions

  • The chemical reaction which contain oxidation as well as reductuib half reaction is called redox reaction.
  • An atom or ion or molecule which undergoes reduction (gain of electrons) is called oxidant (while an atom or molecule) which undergoes oxidation) (loss of electrons) is called reductant.
  • Oxygen shows positive oxidation states (+1 and  2) only in OF2 and O2F2.
  • Maximum oxidation state of an element never more than its group number.
  1. Oxidation state of Mn in KMnO4 is +7.
  2. Oxidation state of Cr in K2Cr2O7 is +6.
  3. Oxidation sate of Cr in CrO5 is +6.
  4. Oxidation state of ‘N’ in N3H is –1/3.
  5. Oxidation state of ‘N’ in NH4NO3(NH4+ and NO3) are –3 and +5.
  6. Oxidation state of ‘Fe’ in FeSO4 is +2.
  7. Oxidation state of ‘Fe’ in Fe3O4 is +8/3.
  • In xMnO4 + yH2O + zI→2MnO4- +8OH-+3l2

x = 2, y = 4, z = 6

  • CH4 + 2O2 →CO2 + 2H2O is an example for chemical combustion.
  • In all combustion reactions oxygen undergoes reduction (0 to –2).
  • In decomposition reaction chemical compound split into two or more simpler substances.


  • In decomposition of MgCO3, no changes in oxidation numbers. So it is not a redox reaction

[MgCO3 →MgO + CO2]

  • Zn(s) + CuSO4(aq) →ZnSO4(aq) + Cu(s) is a displacement reaction.
  • In disproportionation reaction the same element undergoes both oxidation and reduction simultaneously.
  • When Br2 and I2 dissolve in CCl4 solvent to give reddish brown and purple colours respectively. So, they are detected by extracting into CCl4. This is also called “Layer Test”.
  • Comproportion is a reverse of disproportionation reaction. Ag2+(aq)+Ag(s)→2Ag+(s) is a comproportionation reaction.

Do follow NCERT text book and solve questions with the help of Physics Wallah NCERT solutions for class 11 chemistryWe also have Chemistry Doubts section where the most common doubts are explained by our expert faculty.

Download free pdf sheet which consist of formulas and important points of Redox Reactions from the link given below . 

Chemistry formula for class 11 chapter- Redox Reactions

Chemistry formula for class 11 chapter- Redox Reactions

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