Overview: Chemistry Notes on Oxidation and Reduction
General Science Chemistry portion me Oxidation and Reduction (Redox Reactions) par direct chemical equation-based aur daily-life phenomena questions puche jaate hain. RRB NTPC, SSC CGL, CHSL, aur Railway exams me Oxidation Number calculation, Oxidizing vs. Reducing Agents, Rusting of Iron (Corrosion), Galvanization, aur Rancidity par high-frequency conceptual questions aate hain.
Key Concepts Covered in this Redox Study Module
- Classical vs. Electronic Concept: Oxidation (Gain of O / Loss of electrons – OIL) & Reduction (Gain of H / Gain of electrons – RIG).
- Oxidation Number Rules: Free elements (0), Oxygen (-2, except peroxides -1), Hydrogen (+1, except hydrides -1), aur calculation tricks.
- Oxidizing & Reducing Agents: KMnO4, K2Cr2O7, HNO3 (Oxidizing) vs. H2, CO, SO2, LiAlH4 (Reducing).
- Redox in Daily Life: Corrosion of metals, Prevention via Galvanization (Zinc coating), aur Food Rancidity prevention via Antioxidants/Nitrogen gas.
PDF Material Details
| Attribute | Specification Details |
|---|---|
| Topic Name | Chemistry Notes on Oxidation and Reduction |
| Category | General Science — Physical & Applied Chemistry |
| Language | English / Hindi Mix (Aspirant Friendly) |
| Target Exams | RRB NTPC, SSC CGL, SSC CHSL, RRB JE, State PSCs |
| Core Focus | Redox Equations, Oxidation States Calculation, Corrosion, Rancidity & PYQs |
Practice MCQs on Redox Reactions
Apni preparation evaluate karne ke liye niche diye gaye 15 important conceptual MCQs solve karein:
Q1. In terms of electron transfer, Oxidation is defined as:
Check Answer
Answer: Loss of electrons (Remember mnemonic: OIL RIG — Oxidation Is Loss, Reduction Is Gain).
Q2. What is the oxidation number of Manganese (Mn) in Potassium Permanganate (KMnO4)?
Check Answer
Answer: +7. Calculation: (+1) + x + 4(-2) = 0 ➔ x – 7 = 0 ➔ x = +7.
Q3. A substance that oxidizes another substance while itself getting reduced is called an:
Check Answer
Answer: Oxidizing Agent / Oxidant (e.g., KMnO4, K2Cr2O7, Conc. HNO3).
Q4. Rusting of iron is an example of which type of chemical process?
Check Answer
Answer: Slow Redox Reaction (Iron is oxidized to hydrated ferric oxide: Fe2O3·xH2O in the presence of oxygen and moisture).
Q5. What is the oxidation state of Chromium (Cr) in Potassium Dichromate (K2Cr2O7)?
Check Answer
Answer: +6. Calculation: 2(+1) + 2x + 7(-2) = 0 ➔ 2x – 12 = 0 ➔ 2x = 12 ➔ x = +6.
Q6. The process of applying a protective coating of Zinc on iron or steel to prevent rusting is called:
Check Answer
Answer: Galvanization (Zinc acts as a sacrificial anode because it is more easily oxidized than iron).
Q7. What is the oxidation number of Oxygen in Hydrogen Peroxide (H2O2)?
Check Answer
Answer: -1 (In peroxides, oxygen always exhibits an oxidation state of -1 instead of the usual -2).
Q8. The unpleasant smell and taste in fats and oils caused by aerial oxidation is known as:
Check Answer
Answer: Rancidity (Prevented by adding antioxidants like BHA, BHT, or flushing food packets with unreactive Nitrogen gas).
Q9. In the reaction: CuO + H2 ➔ Cu + H2O, which substance undergoes reduction?
Check Answer
Answer: Copper(II) Oxide (CuO) is reduced to elemental Copper (Cu), while H2 is oxidized to H2O.
Q10. What is the oxidation state of Carbon in Carbon Dioxide (CO2)?
Check Answer
Answer: +4. Calculation: x + 2(-2) = 0 ➔ x = +4.
Q11. Which gas is commonly flushed into potato chips packets to prevent them from turning rancid?
Check Answer
Answer: Nitrogen Gas (N2), as it provides an inert, oxygen-free environment.
Q12. What is the oxidation number of an element in its standard free uncombined state (e.g., O2, Cl2, Fe, Na)?
Check Answer
Answer: Zero (0).
Q13. In an electrochemical cell, at which electrode does oxidation always take place?
Check Answer
Answer: Anode (Mnemonic: An Ox, Red Cat — Anode = Oxidation, Reduction = Cathode).
Q14. What is the oxidation state of Sulphur in Sulphuric Acid (H2SO4)?
Check Answer
Answer: +6. Calculation: 2(+1) + x + 4(-2) = 0 ➔ x – 6 = 0 ➔ x = +6.
Q15. A reaction where the same element undergoes both oxidation and reduction simultaneously is known as:
Check Answer
Answer: Disproportionation Reaction (e.g., 2H2O2 ➔ 2H2O + O2, where oxygen goes from -1 to -2 and 0).
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FAQs: Chemistry Notes on Oxidation and Reduction
Q1: What is a Redox Reaction?
Ans: A Redox (Reduction-Oxidation) reaction is a chemical process where oxidation (loss of electrons) and reduction (gain of electrons) take place simultaneously between participating species.
Q2: What is the difference between an Oxidizing agent and a Reducing agent?
Ans: An oxidizing agent causes other substances to lose electrons and gets reduced itself, while a reducing agent donates electrons to others and gets oxidized itself.
Q3: Why is Galvanization used to protect Iron from Rusting?
Ans: Galvanization coats iron with a layer of Zinc. Zinc is more electropositive than iron, so even if the coating is scratched, Zinc oxidizes first, saving the underlying iron from corrosion.
Q4: How can I download Oxidation and Reduction PDF notes on SarkariExamPDF?
Ans: Scroll to the download section above, click "Click to Get Download Link", wait for the 10-second timer to finish, and click "Download PDF Now" to access your free Google Drive file.
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