4. KMnO4 reacts with oxalic acid according to the equation 2MnO4- + 5C2O42- + 16H+ -> 2Mn2+ +10CO2 + 8H2O , Here 20 mL of 0.1 M KMnO4 is equivalent to

Correct Answer is: 50 mL of 0.1 M C 2 H 2 O 4

8. The oxidation state of Cr in Cr (CO)6 is

Correct Answer is: Please check the page for the answer.

Redox Reactions MCQ Multiple Choice Questions Answers | Quiz for Practice

Q: 1. The colorless solution of silver nitrate slowly turns brown on adding copper chips to it because of

Correct Answer is: Oxidation of Cu atoms

Q: 2. The oxidation process involves

Correct Answer is: Increase in oxidation number

Q: 5. Which of the following reactions does not involve either oxidation or reduction?

Correct Answer is: CrO 2 -4 -> Cr 2 O 7 2-

Q: 7. Which of the following processes does not involve oxidation of iron?

Correct Answer is: Formation of Fe (CO) 5 from Fe.

Q: 9. Which of the following processes does not involve either oxidation or reduction?

Correct Answer is: Formation of slaked lime from quick lime

Q: 14. Which of the following is a redox reaction?

Correct Answer is: Zn + 2AgCN -> 2Ag + Zn (CN) 2

Q: 15. Which reaction is not feasible?

Correct Answer is: 2KBr + I 2 -> 2KI + Br 2

Dive into the dynamic world of redox reactions with our comprehensive collection of multiple-choice questions and answers! Explore the principles, types, and applications of oxidation-reduction reactions in chemistry, from corrosion to electrochemistry. Whether you're a chemistry student, an engineer, or simply curious about the chemical processes driving our world, our Redox Reactions MCQs page offers an engaging and educational experience. Test your knowledge, deepen your understanding, and unravel the mysteries of redox chemistry through our carefully crafted quizzes. Visit ObjectiveQuiz.com now to embark on a journey through the electrifying realm of redox reactions!

Redox Reactions MCQ Questions for Practice

1. The colorless solution of silver nitrate slowly turns brown on adding copper chips to it because of

Dissolution of Copper
Oxidation of Ag⁺ -> Ag
Reduction of Cu²⁺ ions
Oxidation of Cu atoms

2. The oxidation process involves

Increase in oxidation number
Decrease in oxidation number
No change in oxidation number
none of the above

3. The oxidation number of Mn is maximum in

MnO₂
K₂MnO₄
Mn₃O₄
KMnO₄

4. KMnO₄ reacts with oxalic acid according to the equation 2MnO₄^- + 5C₂O₄^2- + 16H⁺ -> 2Mn₂+ +10CO₂ + 8H₂O , Here 20 mL of 0.1 M KMnO₄ is equivalent to

50 mL of 0.5 M C₂H₂O₄
20 mL of 0.1 M C₂H₂O₄
20 mL of 0.5 M C₂H₂O₄
50 mL of 0.1 M C₂H₂O₄

5. Which of the following reactions does not involve either oxidation or reduction?

VO₂⁺ -> V₂O₃
Na -> Na⁺
CrO₂^-4 -> Cr₂O₇^2-
Zn²⁺ -> Zn

6. The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is

One
Two
Five
One fifth

7. Which of the following processes does not involve oxidation of iron?

Formation of Fe (CO)₅ from Fe.
Liberation of H₂ from steam by iron at high temperature.
Rusting of iron sheets.
Decolorization of blue CuSO₄ solution by iron.

8. The oxidation state of Cr in Cr (CO)₆ is

9. Which of the following processes does not involve either oxidation or reduction?

Formation of slaked lime from quick lime
Heating Mercuric Oxide
Formation of Manganese Chloride from Manganese oxide
Formation of Zinc from Zinc blende

10. The oxidation number of Cl in Cl₂O₇ is

+7
5
3
-7

11. A metal ion M³⁺ loses 3 electrons, its oxidation number will be

3
6
-3

12. The oxidation number of Sulphur in Na₂S₄O₆ is

13. In oxygen di fluoride the oxidation number of oxygen is

-2
-1
2
+1, -2

14. Which of the following is a redox reaction?

NaCl + KNO₃ -> NaNO₃ + KCl
CaC₂O₄ + 2HCl -> CaCl₂ + H₂C₂O₄
Mg (OH)₂ + 2NH₄Cl -> MgCl₂ + 2NH₄OH
Zn + 2AgCN -> 2Ag + Zn (CN)₂

15. Which reaction is not feasible?

2KI + Br₂ -> 2KBr + I₂
2KBr + I₂ -> 2KI + Br₂
2KBr + Cl₂ -> 2KCl+Br₂
2H₂O + 2F₂ -> 4HF+O₂