MCQ Questions For Class 11 Chemistry Chapter 8 Redox Reactions

Chemistry Chapter 8 Redox Reaction Class 11 MCQ Questions have been gathered for students to rehearse. Students can prepare these MCQ on Redox Reaction Class 11 Chemistry. Each question has four choices with answers. Firstly, Solve all these Questions and check your answer with the given answer. If your answers do not match with the right answer, Don’t worry try again because You need to prepare daily to score higher marks in the Class 11 Chemistry Exam

Please refer to MCQ Questions Redox Reactions for Chapter 8 Class 11 Chemistry given below. All MCQ questions are provided with answers. These MCQ Questions for Class 11 Chemistry are designed based on the chapters given in your CBSE NCERT Textbook for Class 11 Chemistry. These MCQ Questions are expected to come in your class 11 Board exams.

Class 11 Chemistry Redox Reaction MCQ Question with Answer

Question. What is the change in oxidation number of carbon in the following reaction? CH_4(g) + 4Cl_2(g) → CCl_4(l) + 4HCl_(g)                         
(a) + 4 to + 4
(b) 0 to + 4
(c) – 4 to + 4
(d) 0 to – 4 

Question. The oxidation state of Cr in CrO₅ is                         
(a) –6
(b) +12
(c) +6
(d) +4

Question. The correct order of N-compounds in its decreasing order of oxidation states is                             
(a) HNO₃, NO, N₂, NH₄Cl
(b) HNO₃, NO, NH4Cl, N₂
(c) HNO₃, NH₄Cl, NO, N₂
(d) NH₄Cl, N₂, NO, HNO₃

Question. Which of the following is redox reaction?                         
(a) Evaporation of H₂O
(b) Both oxidation and reduction
(c) H₂SO₄ with NaOH
(d) In atmosphere O₃ from O₂ by lightning 

Question. Without losing its concentration, ZnCl₂ solution cannot be kept in contact with                       
(a) Pb
(b) Al
(c) Au
(d) Ag 

Question. The pair of compounds that can exist together is                       
(a) FeCl₃, SnCl₂
(b) HgCl₂, SnCl₂
(c) FeCl₂, SnCl₂
(d) FeCl₃, KI 

Question. A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?           
(a) S
(b) H
(c) Cl
(d) C

Question. Oxidation numbers of P in PO₄ ^3–, of S in SO₄ ^2– and that of Cr in Cr₂O₇ ^2– are respectively                         
(a) +3, +6 and +5
(b) +5, +3 and +6
(c) –3, +6 and +6
(d) +5, +6 and +6

Question. Number of moles of MnO^{4 –} required to oxidize one mole of ferrous oxalate completely in acidic medium will be                         
(a) 7.5 moles
(b) 0.2 moles
(c) 0.6 moles
(d) 0.4 moles. 

Question. Which is the best description of the behaviour of bromine in the reaction given below? H₂O + Br₂ → HOBr + HBr                     
(a) Proton acceptor only
(b) Both oxidised and reduced
(c) Oxidised only
(d) Reduced only

Question. Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the followingreactions does not show oxidizing behaviour?                         
(a) Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O
(b) S + 2H₂SO₄ → 3SO₂ + 2H₂O
(c) C + 2H₂SO₄ → CO₂ + 2SO2 + 2H₂O
(d) CaF2 + H₂SO₄ → CaSO₄ + 2HF

Question. Oxidation state of Fe in Fe₃O₄ is                       
(a) 5 4 
(b) 4 5 
(c) 3  2
(d) 8 3 

Question. Reaction of sodium thiosulphate with iodine gives                       
(a) tetrathionate ion 
(b) sulphide ion
(c) sulphate ion
(d) sulphite ion. 

Question. The oxide, which cannot act as a reducing agent is                   
(a) CO₂
(b) ClO₂
(c) NO₂
(d) SO₂

Question. (I) H₂O₂ + O₃→ H₂O + 2O₂ (II) H2O₂ + Ag₂O →2Ag + H₂O + O₂ Role of hydrogen peroxide in the above reactions is respectively                       
(a) oxidizing in (I) and reducing in (II)
(b) reducing in (I) and oxidizing in (II)
(c) reducing in (I) and (II)
(d) oxidizing in (I) and (II)

Question. The oxidation states of sulphur in the anions SO3 2–, S2O4 2– and S2O6 2– follow the order                       
(a) S₂O₄ ^2– < SO₃ ^2– < S₂O₆ ^2–
(b) SO₃ ^2– < S₂O₄ ^2– < S₂O₆ ^2–
(c) S₂O₄ ^2– < S₂O₆ ^2– < SO₃ ^2–
(d) S₂O₆ ^2– < S₂O₄ ^2– < SO₃ ^2– 

Question. The oxidation state of I in H₄IO^{6 –} is     
(a) + 1
(b) – 1
(c) + 7
(d) + 5

Question. Which of the following process takes place in oxidation process?                               
(a) Addition of oxygen
(b) Addition of hydrogen
(c) Removal of oxygen
(d) Addition of chlorine

Question. In the reaction given below, identify the species undergoing redox reaction 2Na_(s) + H_2(g) → 2NaH_(s)       
(a) Na is reduced and hydrogen is oxidised
(b) Na is oxidised and hydrogen is reduced
(c) Na undergoes oxidation and hydrogen undergoesreduction 
(d) Both (b) and (c)

Question. The loss of electron is termed as                               
(a) oxidation
(b) reduction
(c) combustion
(d) neutralization

Question. In the following reaction 4P + 3KOH+ 3H₂O→3KH₂PO₂ + PH₃                         
(a) phosphorus is both oxidised and reduced.
(b) only phosphorus is reduced.
(c) phosphorus is not oxidised
(d) None of these

Question. Which one of the following reaction involves oxidationreduction ?                               
(a) H₂ +Br₂ →2HBr
(b) NaBr + HCl → NaCl + HBr
(c) HBr + AgNO ₃ → AgBr + HNO ₃
(d) 2NaOH + H₂SO₄ → Na 2SO₄ + 2H₂O

Question. When a strip of metallic zinc is placed in an aqueous solution of copper nitrate the blue colour of the solutiondisappear due to formation of                         
(a) Cu²⁺
(b) Zn²⁺
(c) ZnS
(d) Cus

Question. The correct order of electron releasing tendency of the metals Cu, Zn and Ag is in the order:                     
(a) Cu > Zn > Ag
(b) Zn > Ag > Cu
(c) Ag > Zn > Cu
(d) Zn > Cu > Ag

Question. What is the oxidation number of elements in the free or in the uncombined state ?                             
(a) +1
(b) 0
(c) +2
(d) –1

Question. In which of the following compounds oxygen has highest oxidation state and in which it has lowest oxidation state? OF₂, H₂O₂, KO₂, O₂F₂                   
(a) Highest = KO₂, lowest = H₂O₂
(b) Highest = OF₂, lowest = K₂O2
(c) Highest = OF₂, lowest = KO₂
(d) Highest = KO₂, lowest = H₂O₂

Question. ‘Oxidation number of H in NaH, CaH₂ and LiH, respectively is                         
(a) +1, +1, –1
(b) –1, +1, + 1
(c) +1, + 1, + 1
(d) –1,–1, –1

Question. Which of the following is the correct representative of stock notation for auric chloride?                         
(a) Au(III)Cl₃
(b) Au(II)Cl₂
(c) Au(I)Cl₂
(d) None of these

Question. In reaction, 4Na + O₂ → 2Na₂O, sodium behaves as                                   
(a) oxidising agent
(b) reducing agent
(c) Both (a) and (b)
(d) None of these

Question. Co_(s) + Cu²⁺ _(aq)→Co²⁺ _(aq) + Cu_(s) The above reaction is                                   
(a) oxidation reaction
(b) reduction reaction
(c) redox reaction
(d) None of these

Question. One mole of N₂H₄ loses 10 moles of electrons to form a new compound, y. Assuming that all nitrogen appear in the newcompound, what is the oxidation state of nitrogen in y   There is no change in the oxidation state of hydrogen )                           
(a) –1
(b) –3
(c) +3
(d) +5

Question. Oxidation number of N in HNO₃ is                             
(a) – 3.5
(b) + 3.5
(c) –5
(d) + 5

Question. In which of the following reactions, there is no change in valency ?                               
(a) 4 KClO₃→ 3KClO₄ + KCl
(b) SO₂ + 2H₂S → 2H₂O + 3S
(c) BaO₂ + H₂SO₄→ BaSO₄ + H₂O₂
(d) 3 BaO + O₂ → 2 BaO₂.

Question. The oxidation number of chromium in potassium dichromate is                             
(a) + 6
(b) – 5
(c) – 2
(d) + 2

Question. Oxidation number of nitrogen in (NH₄)2SO₄ is                             
(a) –1/3
(b) –1
(c) +1
(d) –3

Question. Oxidation number of carbon in CH₂Cl₂ is                               
(a) –4
(b) +4
(c) 0
(d) –2

Question. In which of the following compounds, iron has lowest oxidation state?                             
(a) K₃[Fe(CN)₆ ]
(b) K₄[Fe(CN)₆ ]
(c) FeSO₄.(NH₄ )2SO₄.6H₂O
(d) Fe(CO)₅ 

Question. The oxidation state of osmium (Os) in OsO₄ is                           
(a) +7
(b) +6
(c) +4
(d) +8

Question. Which of the following transition metal has zero oxidation state ?                   
(a) [Fe(CO)₅]
(b) NH₂.NH₂
(c) NOClO₄
(d) CrO₅

Question. The oxidation number of sulphur in S₈, S₂F₂, H₂S respectively, are                               
(a) 0, +1 and –2
(b) +2, +1 and –2
(c) 0, +1 and +2
(d) –2, +1 and –2

Question. Oxidation number of cobalt in K[Co(CO)₄] is                                   
(a) +1
(b) +3
(c) –1
(d) –3

Question. In which of the compounds does ‘manganese’ exhibit highest oxidation number ?                                    
(a) MnO₂
(b) Mn3O₄
(c) K2MnO₄
(d) MnSO₄

Question. Among the following, identify the species with an atom in +6 oxidation state                      
(a) MnO4–
(b)Cr(CN)³⁻₆
(c) NiF₆^{– 2}
(d) CrO₂Cl₂

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

Question. The correct name for NO₂ using stock notation is                   
(a) nitrogen dioxide
(b) nitrogen (iv) oxide
(c) nitrogen per oxide
(d) All of these

Question. The oxide, which cannot act as a reducing agent, is                             
(a) NO₂
(b) SO₂
(c) CO₂
(d) ClO₂

Question. The oxidation state of Fe in Fe₃O₄ is                       
(a) + 3
(b) 8/3
(c) + 6
(d) + 2

Question. In oxygen difluoride, the oxidation number of oxygen is                       
(a) – 2
(b) – 1
(c) + 2
(d) +1, – 2

Question. In which of the following compounds the oxidation number of carbon is not zero?                            
(a) HCHO
(b) CH₃COOH
(c) C₁₂H₂₂O₁₁
(d) CH3CHO

Question. In which of the following compounds, the oxidation number of iodine is fractional ?               
(a) IF₇
(b) I⁻₃
(c) IF₅
(d) IF₃

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