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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 2024 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 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

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

During a redox reaction, if a substance gains oxygen, it is said to be:

Detailed Solution for Test: Redox Reactions - Question 2
In a redox reaction, when a substance gains oxygen, it undergoes oxidation. This is because oxidation involves the gain of oxygen or the loss of hydrogen. The substance being oxidised loses electrons, while the substance being reduced gains electrons. This transfer of electrons characterizes redox reactions, illustrating the movement of charge between reactants.
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Test: Redox Reactions - Question 3

What type of reaction occurs when copper is obtained from copper(II) oxide by passing hydrogen gas over the heated material?

Detailed Solution for Test: Redox Reactions - Question 3

It is a redox reaction

H2+CuO→Cu+H2O
these types of reactions, in which oxidation and reduction happen simultaneously, are known as redox reactions. We can also find the substances getting oxidized and reduced by checking the change in oxidation state of each element. Elements which get oxidised attain a higher oxidation state, while the ones getting reduced have their oxidation states lowered.

Test: Redox Reactions - Question 4
What causes the surface of copper powder to become coated with black copper(II) oxide when heated?
Detailed Solution for Test: Redox Reactions - Question 4
When copper powder is heated, it reacts with oxygen to form black copper(II) oxide. This reaction can be represented as: 2Cu + O2 → 2CuO. The black substance formed on the surface is due to the addition of oxygen to copper, resulting in the formation of copper oxide.
Test: Redox Reactions - Question 5
What is the term used to describe a substance that gains oxygen during a reaction?
Detailed Solution for Test: Redox Reactions - Question 5
When a substance gains oxygen during a reaction, it is said to be oxidized. This process involves the loss of electrons by a molecule, atom, or ion. An interesting fact is that oxidation reactions are essential in biological systems, playing a key role in processes like cellular respiration where energy is produced.
Test: Redox Reactions - Question 6

In a redox reaction, what happens to the substance that loses oxygen?

Detailed Solution for Test: Redox Reactions - Question 6

In a redox reaction, the substance that loses oxygen is said to be reduced. This means that it undergoes a process where it loses electrons. Understanding oxidation is crucial in comprehending the flow of electrons in chemical reactions.

Test: Redox Reactions - Question 7
In a redox reaction, if a substance gains oxygen or loses hydrogen, it is said to be:
Detailed Solution for Test: Redox Reactions - Question 7
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.
Test: Redox Reactions - Question 8
What is the term for a reaction where one reactant gains oxygen while another loses oxygen?
Detailed Solution for Test: Redox Reactions - Question 8
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 9
In the reaction between copper and oxygen to form copper(II) oxide, what is the oxidation state of copper in copper oxide?
Detailed Solution for Test: Redox Reactions - Question 9
In copper(II) oxide (CuO), the oxidation state of copper is +2. This is because oxygen typically has an oxidation state of -2, and since the overall compound is neutral, the oxidation state of copper must be +2 to balance the charges.
Test: Redox Reactions - Question 10

What happens when hydrogen gas is passed over heated copper(II) oxide (CuO)?

Detailed Solution for Test: Redox Reactions - Question 10

When hydrogen gas is passed over heated copper(II) oxide, the copper oxide undergoes a decomposition reaction, resulting in the formation of copper and oxygen. This reverse reaction can be represented as: CuO + H2 → Cu + H2O. As a result of this reaction, the black coating of copper oxide on the surface turns brown as copper is obtained.

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