Redox Reactions

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Q1. In the redox reaction 2Ag+ + Zn → 2Ag + Zn2+, which species is oxidized? (2021)

Solution:

Zn is oxidized to Zn2+ as it loses electrons.

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Q2. Which of the following is a reducing agent in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O? (2020)

Solution:

C2O4^2- (oxalate ion) is oxidized to CO2, thus it acts as a reducing agent in this reaction.

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Q3. In the redox reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O, what is the oxidation state of carbon in C2O4^2-?

Solution:

In C2O4^2-, the oxidation state of carbon is +3.

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Q4. Which of the following reactions involves a redox process? (2019)

Solution:

H2O → H2 + O2 involves the oxidation of water to hydrogen and oxygen, making it a redox reaction.

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Q5. Which of the following statements is true regarding reduction? (2020)

Solution:

Reduction is defined as the gain of electrons, and it always occurs simultaneously with oxidation in redox reactions.

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Q6. In the reaction 2Ag+ + Zn → 2Ag + Zn2+, what is the oxidation state of zinc after the reaction?

Solution:

Zinc (Zn) is oxidized to Zn2+, so its oxidation state is +2.

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Q7. In the reaction 2Mg + O2 → 2MgO, which element is oxidized? (2021)

Solution:

Magnesium is oxidized as it loses electrons and its oxidation state increases from 0 to +2.

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Q8. Which of the following reactions is a reduction? (2020)

Solution:

In the reaction Fe2O3 + 3CO → 2Fe + 3CO2, iron (Fe) is reduced as it gains electrons from carbon monoxide (CO).

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Q9. What is the product of the reduction of Cr2O7^2- in acidic medium?

Solution:

In acidic medium, Cr2O7^2- is reduced to Cr^3+.

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Q10. In the reaction Zn + CuSO4 → ZnSO4 + Cu, which species is reduced?

Solution:

Copper (Cu) is reduced as it gains electrons from zinc.