This set of Class 11 Chemistry Chapter 8 Multiple Choice Questions & Answers (MCQs) focuses on “Redox Reactions”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.
1. In the reaction of formation of magnesium oxide magnesium undergoes ________
a) reduction
b) oxidation
c) hydrogenation
d) decomposition
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Explanation: Oxidation is a process that involves the addition of oxygen to an element or compound or the removal of hydrogen from a compound, an example is of this is the formation of magnesium oxide from magnesium.
2. A zinc ion is formed due to oxidation.
a) true
b) false
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Explanation: Oxidation is the loss of electrons by an atom, ion or molecule. it is also known as de–electronation. Zn → Zn2+ + 2e–, the loss of electrons from zinc i.e. formation of zinc is an example of oxidation.
3. Removal of oxygen from a compound is an example of ________
a) oxidation
b) reduction
c) oxygenation
d) dehydrogenation
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Explanation: Reduction is a chemical process, which involves the addition of hydrogen or an element or compound for the removal of oxygen from a compound. An example of reduction is a chemical reaction;
H2 + F2 → 2HF.
4. Reduction involves in __________ oxidation number.
a) decrease
b) increase
c) independence
d) remain constant
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Explanation: The oxidation number is recharged in which an atom appears to have when all the atoms are removed from it as ions. It may have +ve or -ve sign. Reduction results in a decrease in the oxidation number.
5. Formation of copper from copper iron is an example of a reduction.
a) true
b) false
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Explanation: Reduction is the gain of electrons by an atom, ion or molecule this process is known as electronation. Prayer for the formation of copper from copper iron as an example of reduction reaction because the copper gains two electrons in this case.
6. Oxidation is the same as __________
a) addition of hydrogen
b) removal of oxygen
c) addition of oxygen
d) removal of Nitrogen
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Explanation: Oxidation is the same as the addition of oxygen or removal of hydrogen where reduction is the addition of hydrogen or removal of oxygen. Oxidation is caused by an oxidising agent and reduction is caused by a reducing agent.
7. Formation of zinc sulphide is an example of ___________
a) reduction
b) oxidation
c) removal of oxygen
d) addition of hydrogen
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Explanation: Addition of electronegative element or removal of any other electropositive element is also considered as a process that involves oxidation. Here, sulphur is an electronegative element. So the formation of zinc sulphide is an Oxidation reaction.
8. SnCl2 + 2FeCl2 → SnCl4 + 2FeCl2 is an example of __________________ reaction.
a) only oxidation
b) only reduction
c) redox
d) neither oxidation nor reduction
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Explanation: Chemical reactions which involves both oxygen as well as reduction process simultaneously are known as redox reactions. The above given reaction involves both oxidation and reduction reactions, so it is a Redox reaction.
9. SnCl2 + 2FeCl2 → SnCl4 + 2FeCl2. Which of the following element undergoes oxidation in the reaction given?
a) iron
b) tin
c) chlorine
d) ferrous
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Explanation: Tin changes is oxidation state from + 2 to + 4. Increase in oxidation number indicates Oxidation reaction. Oxidation is the loss of electrons by an atom, ion or molecule, it is also known as the de–electronation.
10. Which of the following do you think is a correct statement?
a) oxidation is caused by a reducing agent
b) the oxidation reaction is a Redox reaction
c) addition of electropositive element is a type of oxidation
d) reduction is the addition of hydrogen
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Explanation: Oxidation is caused by an oxidizing agent, both oxidation and reduction reaction is combined together to form a Redox reaction and the addition of electropositive element is a type of reduction so the correct statement is that reduction as the addition of hydrogen.
More MCQs on Class 11 Chemistry Chapter 8:
- Chapter 8 – Redox Reactions MCQ (Set 2)
- Chapter 8 – Redox Reactions MCQ (Set 3)
- Chapter 8 – Redox Reactions MCQ (Set 4)
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