Redox Reactions — Practice Quiz
Maharashtra Board · Class 11 · Chemistry
Try a 4-question quiz on Redox Reactions for Maharashtra Board Class 11 Chemistry: tap an answer to check it and see why.
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Quick Quiz: Redox Reactions
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What is the oxidation number of sulfur in SO₄²⁻?
Which of the following represents oxidation?
In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species is the reducing agent?
What is the oxidation number of chromium in K₂Cr₂O₇?
Sample Questions
Which of the following are characteristics of oxidation? (Select all correct answers)
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Loss of electrons, Increase in oxidation number, Addition of oxygen, Removal of hydrogen
Oxidation can be defined as: loss of electrons, increase in oxidation number, addition of oxygen, or removal of hydrogen. Gain of electrons is reduction.
In which of the following compounds does chlorine have a positive oxidation number?
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HClO
In HClO, H has +1 and O has -2 oxidation numbers. For the compound to be neutral: +1 + Cl + (-2) = 0, so Cl = +1.
Which of the following statements about the standard hydrogen electrode are correct? (Select all correct answers)
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It has E° = 0.00 V, It is used as a reference electrode, It involves H⁺/H₂ couple
The standard hydrogen electrode has E° = 0.00 V by convention and serves as the reference electrode for measuring other electrode potentials. It involves the H⁺/H₂ redox couple.
What happens to the oxidation number of manganese in the reaction: MnO₄⁻ → Mn²⁺?
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Decreases from +7 to +2
In MnO₄⁻, Mn has oxidation number +7. In Mn²⁺, it has +2. The oxidation number decreases from +7 to +2, indicating reduction.
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