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Grade 11 Exam  >  Grade 11 Tests  >  Chemistry for Grade 11 (IGCSE)  >  Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Grade 11 MCQ

Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Grade 11 MCQ


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15 Questions MCQ Test Chemistry for Grade 11 (IGCSE) - Test: Redox Reactions in term of Electron Exchange, Oxidation Number

Test: Redox Reactions in term of Electron Exchange, Oxidation Number for Grade 11 2024 is part of Chemistry for Grade 11 (IGCSE) preparation. The Test: Redox Reactions in term of Electron Exchange, Oxidation Number questions and answers have been prepared according to the Grade 11 exam syllabus.The Test: Redox Reactions in term of Electron Exchange, Oxidation Number MCQs are made for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Redox Reactions in term of Electron Exchange, Oxidation Number below.
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Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 1
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In a redox reaction, which of the following correctly describes the process of reduction?

Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 1
In a redox reaction, reduction is the process in which a species gains electrons, resulting in a decrease in its oxidation number. This process is essential in balancing the transfer of electrons that occurs during redox reactions. It is crucial to understand both oxidation and reduction processes to comprehend the complete electron transfer in a redox reaction.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 2
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Which of the following best defines oxidation in the context of redox reactions?

Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 2
Oxidation in redox reactions refers to the process where a substance loses electrons, leading to an increase in its oxidation number. This process is crucial in understanding how electrons are transferred between species during chemical reactions. Identifying the substance undergoing oxidation is fundamental in balancing redox reactions.
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Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 3
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Based on the principles of redox reactions, which of the following statements is true?

Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 3
In a redox reaction, the reducing agent is the species that gets oxidized by losing electrons. This transfer of electrons from the reducing agent to the oxidizing agent is a fundamental aspect of redox reactions. The reducing agent facilitates the reduction process by providing electrons to the oxidizing agent, which gains these electrons, leading to reduction.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 4
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What does the oxidation number represent in a compound?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 4
The oxidation number, also known as oxidation state, signifies the number of electrons that an atom has gained, lost, or shared during the formation of a compound. It is crucial for monitoring electron movement in redox processes and helps in identifying how atoms behave in a chemical reaction.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 5
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When considering redox reactions, what role do spectator ions play in the overall reaction process?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 5
Spectator ions are ions that do not participate in the chemical reaction and remain unchanged throughout the process. They are present in the reaction mixture but do not undergo any change in oxidation state or composition. Recognizing and removing spectator ions from the reaction equation helps simplify the analysis by focusing solely on the species that actively undergo oxidation and reduction.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 6
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Which element typically exhibits an oxidation state of 3 in compounds?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 6
Aluminum is known to typically exhibit an oxidation state of +3 in compounds. This oxidation state reflects the behavior of aluminum atoms in chemical reactions where they tend to lose three electrons to achieve a stable configuration.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 7
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What is the significance of oxidation numbers in redox processes?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 7
Oxidation numbers play a crucial role in redox processes by helping to monitor electron movement. They indicate how electrons are transferred between atoms during oxidation and reduction, providing insight into the changes that occur in a chemical reaction.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 8
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What color alteration is observed in the solution when acidified potassium manganate(VII) reacts with a reducing agent?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 8
When acidified potassium manganate(VII) reacts with a reducing agent, its purple hue fades to colorless. This color change is a result of the reduction of the manganate(VII) ion to manganese(II) ion, leading to the disappearance of the purple color.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 9
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What is the color change observed in a solution when potassium iodide is added to an oxidizing agent, as per the description provided?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 9
The solution turns red-brown when potassium iodide is added to an oxidizing agent, such as aqueous chlorine or hydrogen peroxide. This color change is due to the formation of iodine (I2) in the solution, which imparts the red-brown color.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 10
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In a redox reaction, what is recognized by changes in the oxidation numbers as reactants transform into products?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 10
Redox reactions are identified by changes in the oxidation numbers as reactants are converted into products. These changes indicate the transfer of electrons between the reactants, leading to oxidation and reduction processes.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 11
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What is the defining characteristic of an oxidizing agent in a chemical reaction?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 11
In a chemical reaction, an oxidizing agent is a substance that causes other substances to be oxidized while it itself undergoes reduction. This means that the oxidizing agent gains electrons during the reaction, leading to its own reduction while causing oxidation in the substances it reacts with. This process is crucial in various chemical reactions and industrial processes.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 12
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Which of the following is NOT typically associated with a reducing agent in a chemical reaction?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 12
A reducing agent is a substance that causes reduction in other substances by itself undergoing oxidation. This means that reducing agents tend to lose electrons and become oxidized during a reaction. The reduction process involves the reducing agent donating electrons to another substance, causing that substance to be reduced. Therefore, increasing the oxidation state is not a characteristic associated with reducing agents.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 13
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Which process occurs when potassium iodide acts as a reducing agent in redox reactions?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 13
When potassium iodide acts as a reducing agent, it undergoes oxidation by losing electrons in the reaction. This process is characteristic of reducing agents, where they facilitate the reduction of other species by themselves undergoing oxidation.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 14
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In the given chemical reaction CuO + H2 → Cu + H2O, which substance acts as the reducing agent?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 14
In the reaction CuO + H2 → Cu + H2O, hydrogen (H2) acts as the reducing agent. The reducing agent is responsible for causing the reduction of another substance, in this case, copper oxide (CuO). By donating electrons to copper oxide, hydrogen itself undergoes oxidation, leading to the formation of copper (Cu) and water (H2O) as products.
Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 15
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Why is reduction considered crucial in the chemical industry for extracting metals from ores?
Detailed Solution for Test: Redox Reactions in term of Electron Exchange, Oxidation Number - Question 15
Reduction is crucial in the chemical industry for extracting metals from ores because it helps in removing impurities from the metals. By subjecting metal ores to reduction reactions, the pure metal is obtained by separating it from the impurities present in the ore. This process is essential for obtaining high-purity metals that meet the required industrial standards.
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