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JSS 2 Exam  >  JSS 2 Tests  >  Test: Redox Reactions - JSS 2 MCQ

Test: Redox Reactions - JSS 2 MCQ


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10 Questions MCQ Test - Test: Redox Reactions

Test: Redox Reactions for JSS 2 2024 is part of JSS 2 preparation. The Test: Redox Reactions questions and answers have been prepared according to the JSS 2 exam syllabus.The Test: Redox Reactions MCQs are made for JSS 2 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Redox Reactions below.
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Test: Redox Reactions - Question 1
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What is the substance gaining oxygen and being oxidized during the described reaction?

Detailed Solution for Test: Redox Reactions - Question 1

In the given reaction, the hydrogen is gaining oxygen and is being oxidized. This means that hydrogen is losing electrons and undergoing a process where it gains oxygen atoms. Understanding the roles of different elements in redox reactions is key to comprehending chemical transformations.

Test: Redox Reactions - Question 2
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In a redox reaction, if a substance gains oxygen or loses hydrogen, it is said to be:

Detailed Solution for Test: Redox Reactions - Question 2
In redox reactions, if a substance gains oxygen or loses hydrogen, it is considered to be oxidised. This process involves the increase in the oxidation state of an atom or molecule. Oxidation results in the loss of electrons or an increase in oxidation state. Therefore, when a substance gains oxygen or loses hydrogen during a reaction, it is undergoing oxidation.
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Test: Redox Reactions - Question 3
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What is the term for a reaction where one reactant gains oxygen while another loses oxygen?

Detailed Solution for Test: Redox Reactions - Question 3
Reactions in which one reactant gains oxygen (is reduced) while another reactant loses oxygen (is oxidized) are known as redox reactions. These reactions are fundamental in various chemical processes and are essential for life, such as in energy production and metabolism.
Test: Redox Reactions - Question 4
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Identify the substances that are oxidised and the substances that is oxidised in the following reactions.
 2PbO + C → 2Pb + CO2
Detailed Solution for Test: Redox Reactions - Question 4


PbO is reduced to Pb and C is oxidised to CO2.

Test: Redox Reactions - Question 5
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Identify the substance oxidised and the substance reduced in the following reactions.

MnO2 + 4HCl —–> MnCl2 + 2H20 + Cl2
Detailed Solution for Test: Redox Reactions - Question 5
MnO2 is getting reduced and HCl is getting oxidised.
Test: Redox Reactions - Question 6
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Identify the substance that is oxidised and reduced in the following reaction.
Chemical Reactions and Equations Class 10 Important Questions with Answers Science Chapter 1 Img 45
Detailed Solution for Test: Redox Reactions - Question 6

 Zn is getting oxidised, CuO is getting reduced.

Test: Redox Reactions - Question 7
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What is the substance gaining oxygen and being oxidized during the described reaction?
Detailed Solution for Test: Redox Reactions - Question 7

- In a redox reaction, one substance is oxidized (loses electrons) and another is reduced (gains electrons).
- Oxidation involves the gain of oxygen.
- Copper (Cu) gains oxygen to form CuO, thus it is oxidized.
- Therefore, the substance gaining oxygen and being oxidized is copper (Cu).
- Correct answer: A: Cu

Test: Redox Reactions - Question 8
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What is a reduction reaction?
Detailed Solution for Test: Redox Reactions - Question 8

In terms of hydrogen and oxygen:

Addition of hydrogen to a substance: Reduction

Removal of oxygen from a substance: Oxidation

Therefore, option A, "addition of hydrogen to a substance," correctly defines a reduction reaction.

Test: Redox Reactions - Question 9
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What is a oxidation reaction?
Detailed Solution for Test: Redox Reactions - Question 9

In terms of hydrogen and oxygen:

Addition of hydrogen to a substance: Reduction

Removal of oxygen from a substance: Oxidation

Therefore, correct answer is option (b)

Test: Redox Reactions - Question 10
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Identify the substances that are oxidised and the substances that are reduced in the following reaction.

Fe2O3 + 2Al → Al2O3 + 2Fe
Detailed Solution for Test: Redox Reactions - Question 10

The reaction provided is:

Fe2O3 + 2Al → Al2O3 + 2Fe

Analysis of the Reaction

In this reaction, we need to identify the substances that are oxidized and reduced.

1. Oxidation

Oxidation is defined as the process in which an element loses electrons. In this reaction:

  • Aluminum (Al) starts with an oxidation state of 0 in its elemental form.
  • In the product Al2O3, aluminum has an oxidation state of +3.
  • This change from 0 to +3 indicates that aluminum has lost electrons.

Therefore, aluminum (Al) is oxidized.

2. Reduction

Reduction is defined as the process in which an element gains electrons. In this reaction:

  • Iron (Fe) in Fe2O3 has an oxidation state of +3.
  • In the product, iron appears as elemental Fe with an oxidation state of 0.
  • This change from +3 to 0 indicates that iron has gained electrons.

Therefore, Fe2O3 is reduced.

Conclusion

Based on the above analysis:

  • The substance that is oxidized is Al.
  • The substance that is reduced is Fe2O3
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