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Balancing Redox Reactions using Oxidation Number Method Video Lecture | Chemistry Class 11 - NEET

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FAQs on Balancing Redox Reactions using Oxidation Number Method Video Lecture - Chemistry Class 11 - NEET

1. What is the oxidation number method for balancing redox reactions?
Answer: The oxidation number method is a technique used to balance redox reactions by assigning oxidation numbers to each element in the reaction. This method involves determining the changes in oxidation numbers and using them to balance the number of electrons transferred.
2. How do you assign oxidation numbers in a redox reaction?
Answer: To assign oxidation numbers, we follow a set of rules. The oxidation number of an element in its elemental state is zero. In most compounds, the oxidation number of oxygen is -2, and hydrogen is +1. The sum of oxidation numbers in a compound is zero, and in a polyatomic ion, it equals the charge of the ion.
3. Can you explain the steps involved in balancing a redox reaction using the oxidation number method?
Answer: Sure! The steps involved in balancing a redox reaction using the oxidation number method are as follows: 1. Assign oxidation numbers to each element in the reaction. 2. Identify the element that undergoes a change in oxidation number (oxidation or reduction). 3. Write separate half-reactions for the oxidation and reduction processes. 4. Balance the atoms in each half-reaction, excluding oxygen and hydrogen. 5. Balance the oxygen atoms by adding water molecules to the side deficient in oxygen. 6. Balance the hydrogen atoms by adding hydrogen ions (H+) to the side deficient in hydrogen. 7. Balance the charges in each half-reaction by adding electrons (e-). 8. Multiply the half-reactions by appropriate coefficients to equalize the number of electrons transferred. 9. Combine the balanced half-reactions, canceling out the electrons. 10. Verify that the atoms and charges are balanced on both sides of the equation.
4. Are there any limitations to the oxidation number method in balancing redox reactions?
Answer: Yes, there are a few limitations to the oxidation number method. This method assumes that the reaction takes place in an aqueous solution and that all species are soluble and present as ions. It also assumes that the reaction occurs under standard conditions. Additionally, the oxidation number method may not work for reactions involving complex molecules or when the reaction mechanism is not well understood.
5. Can you provide an example of balancing a redox reaction using the oxidation number method?
Answer: Certainly! Let's consider the reaction between potassium permanganate (KMnO4) and iron(II) sulfate (FeSO4) in an acidic solution: KMnO4 + FeSO4 + H2SO4 -> K2SO4 + MnSO4 + Fe2(SO4)3 + H2O To balance this reaction, we can follow the oxidation number method and break it down into two half-reactions (oxidation and reduction). After balancing the half-reactions individually, we can then combine them to obtain the balanced overall equation.
195 videos|337 docs|190 tests
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