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Mastering Redox Reactions: Your Class 11 Chemistry MCQ Challenge

Practice Important MCQs for Redox Reaction — Chemistry, Class 11.

The chapter "Redox Reactions" is a cornerstone of Class 11 Chemistry, providing fundamental concepts that are crucial for understanding a vast array of chemical processes. From biological systems like respiration and photosynthesis to industrial applications such as metallurgy, batteries, and corrosion, redox reactions are ubiquitous. A strong grasp of this chapter not only enhances your conceptual understanding of chemical reactivity but also lays the essential groundwork for advanced topics like Electrochemistry in Class 12.

For the CBSE Class 11 examination, questions from Redox Reactions frequently appear, covering various aspects like calculating oxidation states, identifying oxidizing and reducing agents, classifying different types of redox reactions, and most importantly, balancing complex redox equations using both oxidation number and half-reaction methods. Mastering these skills is vital for scoring well and building a robust foundation for competitive exams as well. This quiz is designed to test your knowledge and application of these concepts, strictly adhering to the latest NCERT syllabus and CBSE exam pattern.

30

Minutes

30

Questions

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Question Bank Preview

Q1. What is the oxidation state of manganese (Mn) in $KMnO_4$ ?

(A)

+5

(B)

+6

(C)

+7

(D)

+4

Q2. Which of the following reactions represents a reduction?

(A)

$Fe^{2+} \rightarrow Fe^{3+}$

(B)

$MnO_4^{2-} \rightarrow MnO_4^{-}$

(C)

$Cl_2 \rightarrow 2Cl^{-}$

(D)

$C_2H_4 \rightarrow C_2H_6$

Q3. In the reaction $Zn(s) + CuSO_4(aq) \rightarrow ZnSO_4(aq) + Cu(s)$ , which species is reduced?

(A)

$Zn(s)$

(B)

$CuSO_4(aq)$

(C)

$ZnSO_4(aq)$

(D)

$Cu(s)$

Q4. An oxidizing agent is a substance that:

(A)

Loses electrons

(B)

Gains electrons

(C)

Undergoes oxidation

(D)

Has its oxidation state decreased

Q5. What is the oxidation state of carbon in $CH_4$ ?

(A)

+4

(B)

+2

(C)

-2

(D)

-4

Q6. Identify the type of redox reaction represented by $2KClO_3 \rightarrow 2KCl + 3O_2$ .

(A)

Combination reaction

(B)

Decomposition reaction

(C)

Displacement reaction

(D)

Disproportionation reaction

Q7. In the reaction $H_2S + Cl_2 \rightarrow 2HCl + S$ , the reducing agent is:

(A)

$H_2S$

(B)

$Cl_2$

(C)

$HCl$

(D)

$S$

Q8. Which of the following compounds has the highest oxidation state of nitrogen?

(A)

$NH_3$

(B)

$N_2O$

(C)

$HNO_3$

(D)

$NO_2$

Q9. What is the sum of oxidation states of all atoms in a neutral molecule?

(A)

+1

(B)

-1

(C)

0

(D)

Equal to the charge of the most electronegative atom

Q10. Which of the following reactions is NOT a redox reaction?

(A)

$NaOH + HCl \rightarrow NaCl + H_2O$

(B)

$2Na + Cl_2 \rightarrow 2NaCl$

(C)

$CuO + H_2 \rightarrow Cu + H_2O$

(D)

$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$

Q11. When $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution, the oxidation state of chromium changes from:

(A)

+6 to +3

(B)

+3 to +6

(C)

+6 to +2

(D)

+7 to +3

Q12. How many electrons are involved in the reduction of one mole of $MnO_4^{-}$ to $Mn^{2+}$ ?

(A)

2

(B)

3

(C)

5

(D)

7

Q13. Which of the following is an example of a disproportionation reaction?

(A)

$2H_2O_2 \rightarrow 2H_2O + O_2$

(B)

$N_2 + 3H_2 \rightarrow 2NH_3$

(C)

$Fe + S \rightarrow FeS$

(D)

$Zn + 2HCl \rightarrow ZnCl_2 + H_2$

Q14. Balance the following reaction in acidic medium: $MnO_4^{-} + C_2O_4^{2-} \rightarrow Mn^{2+} + CO_2$ . What is the coefficient of $H^+$ in the balanced equation?

(A)

8

(B)

16

(C)

5

(D)

10

Q15. The oxidation state of iodine in $HIO_4$ is:

(A)

+1

(B)

+5

(C)

+7

(D)

-1

...and 15 more challenging questions available in the interactive simulator.

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