1 markMCQSection A

Which of the following is a redox reaction, but not a combination reaction?

Chemical Reactions and Equations

Chemical Reactions

Options

(A)

\mathrm{C} + \mathrm{O}_2\rightarrow \mathrm{CO}_2

(B)

2\mathrm{H}_2 + \mathrm{O}_2\rightarrow 2\mathrm{H}_2\mathrm{O}

(C)

2\mathrm{Mg} + \mathrm{O}_2\rightarrow 2\mathrm{MgO}

(D)

\mathrm{Fe}_2\mathrm{O}_3 + 3\mathrm{CO}\rightarrow 2\mathrm{Fe} + 3\mathrm{CO}_2

Official Answer

$\mathrm{Fe}_2\mathrm{O}_3 + 3\mathrm{CO}\rightarrow 2\mathrm{Fe} + 3\mathrm{CO}_2$

redox reactioncombination reaction

Marking Scheme

11 mark

Hint

Identify the reaction that involves the transfer of electrons, but does not involve the combination of two or more substances.

Quick Oral Answer

The reaction $\mathrm{Fe}_2\mathrm{O}_3 + 3\mathrm{CO}\rightarrow 2\mathrm{Fe} + 3\mathrm{CO}_2$ is a redox reaction because it involves the transfer of electrons from CO to $\mathrm{Fe}_2\mathrm{O}_3$ . However, it is not a combination reaction because it does not involve the combination of two or more substances to form a new compound.

Analysis & Explanation

A redox reaction involves the transfer of electrons from one species to another. In this case, the reaction between $\mathrm{Fe}_2\mathrm{O}_3$ and CO is a redox reaction because it involves the transfer of electrons from CO to $\mathrm{Fe}_2\mathrm{O}_3$ . However, it is not a combination reaction because it does not involve the combination of two or more substances to form a new compound.

Common Mistakes

1Confusing combination reactions with redox reactions

Interesting Facts

Redox reactions are a type of chemical reaction that involves the transfer of electrons.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Chemical Reactions" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.