Redox Reactions Made Easy: Master Oxidation & Reduction for WAEC/NECO | Upvision Concepts Academy

Are you preparing for WAEC or NECO Chemistry? In this comprehensive tutorial by Upvision Concepts Academy, we break down everything you need to know about Oxidation and Reduction (Redox Reactions) using clear explanations, IUPAC chemical names, and NECO-style practice questions.

🔍 What You’ll Learn in This Video:
✅ Definitions of oxidation and reduction (traditional and modern)
✅ Electron transfer & oxidation numbers
✅ How to identify oxidizing and reducing agents
✅ Redox reaction examples with IUPAC names
✅ Balancing redox equations in acidic medium
✅ Common redox color changes for practical questions
✅ 5 solved NECO-style questions with answers

📚 This video is perfect for WAEC, NECO, JAMB, and school exam prep.

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📘 NECO-STYLE QUESTIONS (IUPAC Naming Format)
Question 1:
In the reaction:
2Fe²⁺ + Cl₂ → 2Fe³⁺ + 2Cl⁻
Identify the oxidized and reduced species.
Answer:
Iron(II) ion (Fe²⁺) is oxidized to iron(III) ion (Fe³⁺)
Dichlorine (Cl₂) is reduced to chloride ion (Cl⁻)

Question 2:
Which of the following is a reducing agent?
A. Potassium manganate(VII)
B. Hydrogen sulfide
C. Nitric acid
D. Chlorine

Answer: B. Hydrogen sulfide (H₂S)

Question 3:
Calculate the oxidation number of sulfur in tetraoxosulfate(VI) acid (H₂SO₄).

Solution:
Let x = oxidation number of sulfur
2(+1) + x + 4(–2) = 0
2 + x – 8 = 0
x = +6
Answer: +6

Question 4:
Which of the following is a redox reaction?
A. Hydrochloric acid + sodium hydroxide → sodium chloride + water
B. Copper(II) ion + zinc → copper + zinc ion
C. Ammonium chloride → ammonia + hydrogen chloride
D. Silver nitrate + sodium chloride → sodium nitrate + silver chloride

Answer: B. Copper(II) ion + zinc → copper + zinc ion

Question 5:
In acidic medium, the color change of potassium manganate(VII) when reduced is:
A. Purple to pink
B. Purple to blue
C. Purple to colourless
D. Purple to green

Answer: C. Purple to colourless

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