Redox Reactions - Class 10 Science Free MCQ Test with solutions

Test: Redox Reactions - Question 1

What is the substance gaining oxygen and being oxidized during the described reaction?
CuO (s)+H₂(g)→Cu (s) + H₂O (l)

A.
Copper(ll) oxide
B.
Hydrogen
C.
Oxygen
D.
Water

Detailed Solution: Question 1

Oxidation is the process of gaining oxygen or losing electrons.

In the reaction:

H₂gains 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

In a redox reaction, if a substance gains oxygen or loses hydrogen, it is said to be:

A. Oxidised
B. Reduced
C. Neutral
D. Inert

Detailed Solution: 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

What is the term for a reaction where one reactant gains oxygen while another loses oxygen?

A. Neutralization
B. Hydrolysis
C. Redox
D. Sublimation

Detailed Solution: 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

Identify the substances that are oxidised in the following reactions.
2PbO + C → 2Pb + CO₂

A.
Pb
B.
C
C.
PbO
D.
CO₂

Detailed Solution: Question 4

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

Test: Redox Reactions - Question 5

Identify the substance oxidised and the substance reduced in the following reactions.
MnO₂ + 4HCl —–> MnCl₂ + 2H₂0 + Cl₂

A.
MnO₂ is getting reduced and H₂0 is getting oxidised.
B.
MnO₂ is getting reduced and HCl is getting oxidised.
C.
MnCl₂is getting reduced and HCl is getting oxidised.
D.
HCl is getting reduced and Cl₂ is getting oxidised.

Detailed Solution: 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

Identify the substance that is oxidised and reduced in the following reaction.
CuO(s) + Zn(s) → Cu(s) + ZnO(s)

A.
CuO-reduced and Zn-oxidised
B.
Zn- reduced and CuO oxidised
C.
Cu- reduced and Zn-oxidised
D.
ZnO- reduced, Zn-oxidised

Detailed Solution: 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

What is the substance gaining oxygen and being oxidized during the described reaction?
2Cu(s) + O²(g) → 2CuO(s)

A.
Cu
B.
O
C.
CuO
D.
Not a redox reaction

Detailed Solution: 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

What is a reduction reaction?

A.
addition of hydrogen to a substance
B.
addition of oxygen to a substance
C.
removal of hydrogen from a substance
D.
none of the above

Detailed Solution: 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

What is a oxidation reaction?

A.
addition of hydrogen to a substance
B.
addition of oxygen to a substance
C.
removal of oxygen from a substance
D.
none of the above

Detailed Solution: 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

Identify the substances that are oxidised and the substances that are reduced in the following reaction.
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

A.
Fe₂O₃
B.
Al
C.
Fe
D.
Both A and B

Detailed Solution: Question 10

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

Reaction: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

Oxidation involves the loss of electrons.
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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Redox Reactions - Free MCQ Practice Test with solutions, Class 10 Science

MCQ Practice Test & Solutions: Test: Redox Reactions (10 Questions)

What is the substance gaining oxygen and being oxidized during the described reaction?
CuO (s)+H₂(g)→Cu (s) + H₂O (l)

In a redox reaction, if a substance gains oxygen or loses hydrogen, it is said to be:

What is the term for a reaction where one reactant gains oxygen while another loses oxygen?

Identify the substances that are oxidised in the following reactions.
2PbO + C → 2Pb + CO₂

Identify the substance oxidised and the substance reduced in the following reactions.
MnO₂ + 4HCl —–> MnCl₂ + 2H₂0 + Cl₂

Identify the substance that is oxidised and reduced in the following reaction.
CuO(s) + Zn(s) → Cu(s) + ZnO(s)

What is the substance gaining oxygen and being oxidized during the described reaction?
2Cu(s) + O²(g) → 2CuO(s)

What is a reduction reaction?

What is a oxidation reaction?

Identify the substances that are oxidised and the substances that are reduced in the following reaction.
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

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Redox Reactions - Free MCQ Practice Test with solutions, Class 10 Science

MCQ Practice Test & Solutions: Test: Redox Reactions (10 Questions)

What is the substance gaining oxygen and being oxidized during the described reaction?CuO (s)+H2 ​(g)→Cu (s) + H2​O (l)

In a redox reaction, if a substance gains oxygen or loses hydrogen, it is said to be:

What is the term for a reaction where one reactant gains oxygen while another loses oxygen?

Identify the substances that are oxidised in the following reactions. 2PbO + C → 2Pb + CO2

Identify the substance oxidised and the substance reduced in the following reactions.MnO2 + 4HCl —–> MnCl2 + 2H20 + Cl2

Identify the substance that is oxidised and reduced in the following reaction. CuO(s) + Zn(s) → Cu(s) + ZnO(s)

What is the substance gaining oxygen and being oxidized during the described reaction? 2Cu(s) + O2(g) → 2CuO(s)

What is a reduction reaction?

What is a oxidation reaction?

Identify the substances that are oxidised and the substances that are reduced in the following reaction.Fe2O3 + 2Al → Al2O3 + 2Fe

Science Class 10

Science Class 10

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About this Class 10 Practice Test

Explore more Class 10 Study Resources

What is the substance gaining oxygen and being oxidized during the described reaction?
CuO (s)+H₂(g)→Cu (s) + H₂O (l)

Identify the substances that are oxidised in the following reactions.
2PbO + C → 2Pb + CO₂

Identify the substance oxidised and the substance reduced in the following reactions.
MnO₂ + 4HCl —–> MnCl₂ + 2H₂0 + Cl₂

Identify the substance that is oxidised and reduced in the following reaction.
CuO(s) + Zn(s) → Cu(s) + ZnO(s)

What is the substance gaining oxygen and being oxidized during the described reaction?
2Cu(s) + O²(g) → 2CuO(s)

Identify the substances that are oxidised and the substances that are reduced in the following reaction.
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe