Assignment on Redox reaction (Unsolved)

Assignment on Redox reaction (Unsolved)

Q.1. The colorless solution of silver nitrate slowly turns brown on adding copper chips to it because of
(a) Dissolution of Copper
(b) Oxidation of Ag⁺ → Ag
(c) Reduction of Cu²⁺ ions
(d) Oxidation of Cu atoms.

Q.2. The oxidation process involves
(a) Increase in oxidation number
(b) Decrease in oxidation number
(c) No change in oxidation number
(d) none of the above

Q.3. The oxidation number of Mn is maximum in
(a) MnO₂
(b) K₂MnO₄                                            
(c) Mn₃O₄
(d) KMnO₄.

Q.4. KMnO₄​reacts with oxalic acid according to the equation
2MnO₄^–​ + 5C₂​O₄​^2-​ + 16H⁺ → 2Mn²⁺​ +10CO₂​ + 8H₂​O, Here 20 mL of 0.1 M KMnO₄​ is equivalent to
(a) 50 mL of 0.5 M C₂H₂O₄
(b) 20 mL of 0.1 M C₂H₂O₄
(c) 20 mL of 0.5 M C₂H₂O₄
(d) 50 mL of 0.1 M C₂H₂O₄

Q.5. Which of the following reactions does not involve either oxidation or reduction?
(a) VO₂⁺ → V₂O₃
(b) Na → Na⁺                                       
(c) CrO₂^-4 → Cr₂O₇^2-                     
(d) Zn²⁺ →Zn

Assignment on Redox reaction (Unsolved)

Q.6. The number of moles of KMnO₄ reduced by one mole of KI in an alkaline medium is
(a) One                                   (b) Two
(c) Five                                   (d) One-fifth.

Q.7. Which of the following processes does not involve the oxidation of iron?
(a) Formation of Fe (CO)₅ from Fe.
(b) Liberation of H₂ from steam by iron at high temperature.
(c) Rusting of iron sheets.
(d) Decolorization of blue CuSO₄ solution by iron.

Q.8. The oxidation state of Cr in Cr (CO)₆ is
(a) 0                                       (b) 2
(c) 2                                       (d) 6

Q.9. Which of the following processes does not involve either oxidation or reduction?
(a) Formation of slaked lime from quick lime
(b) Heating Mercuric Oxide
(c) Formation of Manganese Chloride from Manganese oxide
(d) Formation of Zinc from Zinc blended

Q.10. The oxidation number of Cl in Cl₂O₇ is
(a) + 7                                                (b) + 5
(c) + 3                                                (d) – 7

Assignment on Redox reaction (Unsolved)

Q.11. A metal ion M³⁺ loses 3 electrons, its oxidation number will be
(a) +3                                     (b) +6
(c) 0                                       (d) -3

Q.12. The oxidation number of Sulphur in Na₂S₄O₆ is
(a) 1.5                                    (b) 2.5
(c) 3                                       (d) 2

Q.13. In oxygen di fluoride the oxidation number of oxygen is
(a)  -2                                     (b) -1
(c) +2                                     (d) +1, -2

Q.14. Which of the following is a redox reaction?
(a) NaCl + KNO₃ →NaNO₃ + KCl
(b) CaC₂O₄ + 2HCl →CaCl₂ + H₂C₂O₄
(c) Mg (OH)₂ + 2NH₄Cl →MgCl₂ + 2NH₄OH
(d) Zn + 2AgCN →2Ag + Zn (CN)₂

Q.15. Which reaction is not feasible?
(a) 2KI + Br₂ →2KBr + I₂
(b) 2KBr + I₂ →2KI + Br₂
(c) 2KBr + Cl₂ →2KCl+Br₂
(d) 2H₂O + 2F₂ →4HF+O₂

ASSERTION REASONING BASED QUESTIONS

INSTRUCTION: FOR QUESTIONS NUMBER 26 TO 40.        
Read the assertion and reason carefully to mark the correct option out of the options given below:
(A). If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B). If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(C). If the assertion is true but the reason is false.
(D). If the assertion is false but the reason is true.
(E). If the assertion and reason both are false.

Assignment on Redox reaction (Unsolved)

Q.16. Assertion: Fluorine exists only in the -1 oxidation state.
Reason: Fluorine has 2s²2p⁵ configuration.

Q.17. Assertion: Redox reactions are called neutralization reactions.
Reason: the number of electrons gained or lost in the reaction is balanced.

Q.18. Assertion: HClO₄ is a stronger acid than HClO₃.
Reason: Oxidation state of Cl in HClO₄ is +VII and in HClO₃ is +V.

Q.19. Assertion: In a reaction Zn(s)+CuSO₄(aq)→ ZnSO₄(aq)+Cu(s),  Zn is a reductant but itself get oxidized.
Reason: In a redox reaction, the oxidant is reduced by accepting electrons, and the reductant is oxidized by losing electrons.

Q.20. Assertion: oxidation number of phosphorus in P₄ is zero.
Reason: Phosphorus has Oxidation State zero in all its compounds.

COMPREHENSION BASED QUESTIONS

Read the given passage and answer the questions that follow: (QUESTION 41-45)

Redox reactions are reactions in which oxidation and reduction take place simultaneously. Oxidation numbers are assigned in accordance with the set of rules. Oxidation number and ion-electron methods both are used in balancing ionic equations. Redox reactions are classified as a combination, decomposition, displacement, and disproportionation reactions. The concept of redox couple and electrode processes is the basis of electrolysis and electrochemical cells.
Q.21. What are the oxidation numbers of each individual Br in Br₃O₈?
Q.22. If electrolysis of CuSO₄ solution is carried out using Cu electrodes, what will be the reaction taking place at the anode.
Q.23. What is the oxidation number of Cr in CrO₅?
Q.24. Give one example of a disproportionation reaction.
Q.25. MnO₄ ^2– + H⁺ → MnO₄ ^– + MnO₂ + H₂O [Balance this reaction]

Assignment on Redox reaction (Unsolved)

To test your knowledge click the Quiz of chapter Chemical Bonding and Molecular Structure

https://www.sciencemotive.com/class11/quiz-chemical-bonding-and-molecular-structure/