Physical Chemistry - Redox Reactions

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Q1. What is the balanced equation for the redox reaction between Cr2O7^2- and Fe^2+ in acidic medium? (2020)

Solution:

The balanced equation in acidic medium is Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+.

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Q2. Which of the following species is the strongest oxidizing agent? (2023)

Solution:

F2 is the strongest oxidizing agent among the halogens due to its high electronegativity and ability to gain electrons.

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Q3. Which of the following reactions is an example of a redox reaction? (2023)

Solution:

The reaction C + O2 → CO2 is a redox reaction because carbon is oxidized and oxygen is reduced.

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Q4. Which of the following species is oxidized in the reaction 2Na + Cl2 → 2NaCl? (2023)

Solution:

In this reaction, sodium (Na) is oxidized as it loses electrons to form Na+.

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Q5. What is the oxidation state of nitrogen in NH4Cl? (2023)

Solution:

In NH4Cl, the oxidation state of nitrogen is -3, as it is bonded to four hydrogens.

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Q6. What is the standard reduction potential of the half-reaction Cu2+ + 2e- → Cu? (2022)

Solution:

The standard reduction potential for the half-reaction Cu2+ + 2e- → Cu is +0.76 V, indicating a strong tendency to gain electrons.

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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 the reaction 2Fe²⁺ + 2MnO4⁻ → 2Fe³⁺ + 2Mn²⁺, what is the oxidation state change for iron? (2021)

Solution:

Iron changes its oxidation state from +2 to +3, indicating that 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 primary product when potassium permanganate (KMnO4) is reduced in acidic medium? (2019)

Solution:

In acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+.