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Class 10 Exam  >  Class 10 Tests  >  Science Class 10  >  Test: Redox Reactions - Class 10 MCQ

Test: Redox Reactions - Class 10 MCQ


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10 Questions MCQ Test Science Class 10 - Test: Redox Reactions

Test: Redox Reactions for Class 10 2025 is part of Science Class 10 preparation. The Test: Redox Reactions questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Redox Reactions MCQs are made for Class 10 2025 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?

CuO (s)+H2 ​(g)→Cu (s) + H2​O (l)

Detailed Solution for Test: Redox Reactions - Question 1

Oxidation is the process of gaining oxygen or losing electrons.

In the reaction:

H2​ gains oxygen to form H2O. Hence, hydrogen (H₂) is oxidized.

CuO loses oxygen to form Cu. Hence, copper(II) oxide (CuO) is reduced.

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 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
  • Manganese dioxide (MnO2) contains manganese in a higher oxidation state and gets reduced to manganese(II) chloride (MnCl2), where manganese has a lower oxidation state.
  • In the reaction, hydrochloric acid (HCl) donates electrons, leading to the formation of chlorine gas (Cl2), indicating that HCl is oxidised.
  • Hence, MnO2 is reduced and HCl is oxidised.
Test: Redox Reactions - Question 6
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Identify the substance that is oxidised and reduced in the following reaction.
CuO(s) + Zn(s) → Cu(s) + ZnO(s)
Detailed Solution for Test: Redox Reactions - Question 6
  • In the reaction CuO + Zn → Cu + ZnO:
  • Oxidation is the loss of electrons, while reduction is the gain of electrons.
  • Zn (zinc) loses electrons to form ZnO, so it is oxidised.
  • CuO (copper(II) oxide) gains electrons to form Cu, so it is reduced.
  • Thus, Zn is oxidised and CuO is reduced.
Test: Redox Reactions - Question 7
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What is the substance gaining oxygen and being oxidized during the described reaction?
2Cu(s) + O2(g) → 2CuO(s)
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: Reduction

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 oxygen to a substance: Oxidation

Removal of hydrogen 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

To identify the substances that are oxidized and reduced in the given reaction:

Reaction: Fe2O3 + 2Al → Al2O3 + 2Fe

  1. Oxidation involves the loss of electrons.
  2. Reduction involves the gain of electrons.

  • Iron (Fe) in Fe₂O₃:

    • In Fe₂O₃, iron is in the +3 oxidation state.
    • In elemental Fe, the oxidation state is 0.
    • Thus, Fe is reduced from +3 to 0.

  • Aluminum (Al):

    • In elemental Al, the oxidation state is 0.
    • In Al₂O₃, aluminum is in the +3 oxidation state.
    • Thus, Al is oxidized from 0 to +3.

Substances:

  • Substance reduced: Fe₂O₃ (iron is reduced to Fe).
  • Substance oxidized: Al (aluminum is oxidized to Al₂O₃).

Correct Answer: (d) Both A and B
Explanation: Fe₂O₃ is reduced, and Al is oxidized.

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