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Q1. In a redox reaction, what happens to the oxidation state of the reducing agent? (2021)
Solution:
The oxidation state of the reducing agent decreases as it loses electrons during the reaction.
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Q2. In the reaction 2MnO4⁻ + 5C2O4²⁻ + 16H⁺ → 2Mn²⁺ + 10CO2 + 8H2O, which species is reduced? (2019)
Solution:
In this reaction, MnO4⁻ is reduced to Mn²⁺ as it gains electrons.
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Q3. What is the primary product when potassium permanganate (KMnO4) is reduced in acidic medium? (2019)
Solution:
In acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+.
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Q4. In a redox reaction, if the oxidation state of an element decreases, what has occurred? (2021)
Solution:
A decrease in oxidation state indicates that the element has gained electrons, which is defined as reduction.
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Q5. In the reaction 2Ag⁺ + Zn → 2Ag + Zn²⁺, which species is reduced? (2023)
Solution:
In this reaction, Ag⁺ gains electrons to form Ag, thus it is reduced.
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Q6. Which of the following is the oxidizing agent in the reaction: 2MnO4⁻ + 5C2O4²⁻ + 6H⁺ → 2Mn²⁺ + 10CO2 + 3H2O? (2022)
Solution:
In this reaction, MnO4⁻ is reduced to Mn²⁺, thus it acts as the oxidizing agent.
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Q7. In a redox reaction, the substance that gains electrons is called: (2021)
Solution:
The substance that gains electrons in a redox reaction is called the oxidizing agent.
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Q8. In a redox reaction, if the oxidation state of an element increases, what happens to that element? (2021)
Solution:
An increase in the oxidation state of an element indicates that it has lost electrons, which means it is oxidized.
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Q9. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, what is being oxidized? (2021)
Solution:
In this reaction, Fe²⁺ is being oxidized to Fe³⁺ as it loses electrons.
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Q10. What is the role of MnO4⁻ in acidic medium during redox reactions? (2020)
Solution:
MnO4⁻ acts as an oxidizing agent in acidic medium, as it gains electrons and is reduced.
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