MCQs For NCERT Class 11 Chemistry Chapter 8 Redox Reactions

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Please refer to the MCQ Questions for Class 11 Chemistry Chapter 8 Redox Reactions with Answers. The following Redox Reactions Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.

Redox Reactions Class 11 MCQ Questions with Answers

See below Redox Reactions Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below. 

Question. The number of electrons involved in the reduction of one nitrate ion to hydrazine is                       
(a) 8
(b) 5
(c) 3
(d) 7

Question. The average oxidation state of sulphur in Na₂S₄O₆ is                     
(a) +2.5
(b) +2
(c) +3.0
(d) +3.5

Question. Which of the following species can function both as oxidizing as well as reducing agent ?                  
(a) Cl^–
(b) ClO^{4 –}
(c) ClO^–
(d) MnO^{4 –}

Question. The oxidation number of an element in a compound is evaluated on the basis of certian rules. Which of thefollowing rules is not correct in this respect?                 
(a) The oxidation number of hydrogen is always + 1.
(b) The algebraic sum of all the oxidation numbers in a compound is zero.
(c) An element in the free or the uncombined state bears oxidation number zero.
(d) In all its compounds, the oxidation number of fluorineis – 1. 

Question. Oxygen has an oxidation state of +2 in the compound                         
(a) H₂O₂
(b) CO₂
(c) H₂O
(d) F₂O

Question. Nitric oxide acts as a reducing agent in the reaction                 
(a) 4NH₃ + 5O₂ →4NO+ 6H₂O
(b) 2NO+ 3I₂ + 4H₂O→ 2NO− 3+ 6l − +8H⁺
(c) 2NO + H₂SO₃ →N₂O + H₂SO₄
(d) 2NO+ H₂S→ N₂O+ S+ H₂O

Question. In the compounds KMnO4and K₂Cr₂O₇ the highest oxidation state is of the element                       
(a) potassium
(b) manganese
(c) chromium
(d) oxygen

Question. Atomic number of an element is 22. The highest O.S. exhibited by it in its compounds is                         
(a) 1
(b) 2
(c) 3
(d) 4

Question. Why the displacement reactions of chlorine, bromine and iodine using fluorine are not generally carried out in aqueous solution?                     
(a) chlorine, bromine and iodine reacts with water and displace oxygen of water
(b) Fluorine being very reactive attacks water and displaces oxygen of water
(c) Fluorine does not react with chlorine, bromine and iodine in aqueous media
(d) None of these

Question. Which of the following statement is not true ?                                 
(a) Displacement reaction of chlorine with Br– and I^– form the basis of identifying Br– and I– in laboratory using layer test
(b) F₂, Cl₂, Br₂ and I₂ can be recovered by halogendisplacement reactions by using their respective  halides
(c) F₂ can be recovered from F^– by oxidising itelectrolytically. 
(d) None of these.

Question. Which one of the following reactions involves disproportionation?                                 
(a) 2H₂SO₄ + Cu→ CuSO₄ + 2H₂O + SO₂
(b) As₂O₃ + 3H₂S →As₂S₃ + 3H₂O
(c) 2KOH + Cl₂ → KCl + KOCl + H₂O
(d) Ca₃P₂ + 6H₂O→ 3Ca(OH)₂ + 2PH₃

Question. The following species will not exhibit disproportionation reaction                           
(a) ClO^–
(b) ClO2⁻
(c) ClO3⁻
(d) ClO4⁻

Question. In the reaction 3Br₂+6CO₃²⁻+3H₂O→5Br⁻+BrO⁻₃+6HCO⁻₃                         
(a) Bromine is oxidised and carbonate is reduced.
(b) Bromine is reduced and water is oxidised
(c) Bromine is neither reduced nor oxidised
(d) Bromine is both reduced and oxidised

Question. Which of the following elements does not show disproportionation tendency?                                 
(a) Cl
(b) Br
(c) F
(d) I

Question. Phosphorus, sulphur and chlorine undergo disproportion in the …A… medium. Here, A refers to                 
(a) acidic
(b) alkaline
(c) neutral
(d) Both (a) and (b)

Question. How will you balance the total ionic charge of reactant and products if reaction is carried out in acidic solution?                           
(a) By using H⁺ ions
(b) By using OH^– ions
(c) Adding H₂O molecules to the reactant or product
(d) Multiplying by suitable coefficients.

Question. Consider the following reaction occuring in basic medium – – 4 2MnO _(aq)+Br _(aq)→2MnO_{2 (s)} + Br ^– ₃ O _(aq) How the above reaction can be balanced further?     
(a) By adding 2 OH^– ions on right side
(b) By adding one H₂O molecule to left side
(c) By adding 2H⁺ ions on right side
(d) Both (a) and (b)

Question. For the reaction : NH₃ + OCl − →N₂H₄ + Cl⁻ in basic medium, the coefficients of NH₃, OCl– and N₂H₄ for the balanced equation are respectively                 
(a) 2, 2, 2
(b) 2, 2, 1
(c) 2, 1, 1
(d) 4, 4, 2

Question. C2H_{6 (g)} + nO_2(g) + CO_2(g) + H2O_(l) In this equation, the ratio of the coefficients of CO₂ andH₂O is           
(a) 1 : 1
(b) 2 : 3
(c) 3 : 2
(d) 1 : 3

Question. 2MnO⁻₄+ 5H₂O₂ + 6H+ → 2 Z+ 5O₂ +8H₂O. In this reaction Z is                           
(a) Mn+2
(b) Mn+4
(c) MnO2
(d) Mn

Question. In the redox reaction, xKMnO₄ + NH₃→ yKNO₃ + MnO₂ + KOH + H₂O                     
(a) x = 4, y = 6
(b) x = 3, y = 8
(c) x = 8, y = 6
(d) x = 8, y = 3

Question. What is ‘A’ in the following reaction 2Fe³⁺_(aq) +Sn²⁺_(aq) →2Fe²⁺_(aq) + A                           
(a) Sn³⁺ (aq)
(b) Sn⁴⁺ (aq) 
(c) Sn²⁺ (aq)
(d) Sn

Question. The values of x and y in the following redox reaction x Cl₂ + 6OH→ ClO⁻₃ + yCl⁻ + 3H₂O are                     
(a) x = 5, y = 3
(b) x = 2, y = 4
(c) x = 3, y = 5
(d) x = 4, y = 2

Question. Given E^Θ                                  
(i) Mg²⁺/Mg(s), E^Θ = –2.36
(ii) Ag⁺/Ag(s), E^Θ = 0.80
(iii) Al³⁺/Al(s), E^Θ = –1.66
(iv) Cu²⁺/Cu(s), E^Θ = 0.52
Out of the above given elements which is the strongest oxidising agent and which is the weakest oxidising agent ?
(a) (iv) is the strong whereas (ii) is the weakest oxidising  agent
(b) (ii) is the strongest whereas (i) is the weakest oxidising agent
(c) (i) is the strongest whereas (ii) is the weakestoxidising agent 
(d) (ii) is the strongest whereas (iii) is the weakest oxidising agent

Question. Stronger is oxidising agent, more is                               
(a) standard reduction potential of that species
(b) the tendency to get it self oxidised
(c) the tendency to lose electrons by that species
(d) standard oxidation potential of that species

Question. The standard reduction potentials at 298K for the following half reactions are given against each
Zn²⁺ (aq) + 2e⇌Zn(s) ; –0.762 V
Cr³⁺ (aq) + 3e ⇌ Cr (s); –0.740 V
2H⁺ (aq)   2e ⇌ H² (g) ; 0.00 V
Fe³⁺ (aq) + e ⇌ Fe²⁺ (aq) ; 0.770 V                     A                         
Which is the strongest reducing agent?
(a) Zn (s)
(b) Cr (s)
(c) H2(g)
(d) Fe³⁺ (aq)

Question. The standard reduction potentials for Cu²⁺/Cu; Zn²⁺/Zn; Li⁺/Li; Ag⁺/Ag and H⁺/H₂ are + 0.34 V, – 0.762 V,– 3.05 V, + 0.80 V and 0.00 V respectively. Choose the  strongest  educing agent among the following                     
(a) Zn
(b) H₂
(c) Ag
(d) Li

Question. Arrange the following in the order of their decreasing electrode potentials : Mg, K, Ba and Ca                   
(a) K, Ca, Ba, Mg
(b) Ba, Ca, K, Mg
(c) Ca, Mg, K, Ba
(d) Mg, Ca, Ba, K

Question. The standard electrode potentials of four elements A, B, C and D are –3.05, –1.66, –0.40 and +0.80. The highest chemicalreactivity will be exhibited by                       
(a) A
(b) B
(c) C
(d) D

Question. Which of the following statement(s) is/are correct for the given reaction?                             
2HgCl₂ (aq) + SnCl₂(aq) → Hg₂Cl₂(s) + SnCl₄(aq)
(i) Mercuric chloride is reduced to Hg₂Cl₂
(ii) Stannous chloride is oxidised to stannic chloride
(iii) HgCl₂ is oxidised to Hg₂Cl₂
(iv) It is an example of redox reaction
(a) (i), (ii) and (iv)
(b) (i) and (ii)
(c) (iii) and (iv)
(d) (iii) only

Question. Which of the following sequences of T and F is correct for given statements. Here T stands for true and F standsfor false statements                       
(i) Reducing agents lower the oxidation number of an element in a given substance. These reagents are also called as reductants
(ii) Reducing agents are acceptor of electrons
(iii) Loss of electron(s) by any species is called oxidation reaction
(iv) Oxidation and reduction always occur simultaneously.
(a) TTTT
(b) TFTT
(c) TFFT
(d) FTTT

Question. If aqueous solution of H2O2 is made acidic. For this which of the following statement(s) is/are correct ?   
(i) This aqueous solution oxidizes I–
(ii) This aqueous solution oxidizes F–(a) Both statements (i) and (ii) are correct.
(b) Statement (i) is correct and (ii) is incorrect.
(c) Statement (ii) is correct and (i) is incorrect.
(d) Both statements (i) and (ii) are incorrect.

Question. Which of the following statement(s) is/are correct ?                                       
(i) All alkali metals and some alkaline earth metals (Ca, Sr and Ba) displace hydrogen from cold water.
(ii) Magnesium and iron react with steam as well as acids to produce hydrogen gas.
(iii) Cadmium and tin do not react with steam but displace hydrogen from acids.
(a) (i) and (ii)
(b) (ii) only
(c) (i) and (iii)
(d) (i), (ii) and (iii)

QuestionWhich of the following statement(s) is/are correct ?                               
(i) A negative value of E– means that the redox couple is a weaker reducing agent than the H+/H2 couple.
(ii) A positive E– means that the redox couple is weaker reducing agent than the H+/H2.
Which of the following code is incorrect regarding above statements?
(a) Only (i)
(b) only (ii)
(c) Both (i) and (ii)
(d) Neither (i) nor (ii)

Question. Which of the following statement(s) is/are correct ?                           
(i) Oxidation state of carbon in C₃H₄ is –(4/3).
(ii) Electrons are never shared in fraction.
(a) (i) and (ii)
(b) Only (i)
(c) Only (ii)
(d) Neither (i) nor (ii)

Question. Among NH₃, HNO₃, NaN₃ and Mg3N₂ the number of molecules having nitrogen in negative oxidation state is                             
(a) 1
(b) 2
(c) 3
(d) 4

Question. The correct decreasing order of oxidation number of oxygen in compounds BaF₂, O₃, KO₂ and OF₂ is       
(a) BaO₂ > KO₂ > O₃ > OF₂
(b) OF₂ > O₃ > KO₂ > BaO₂
(c) KO₂ > OF2 > O₃ > BaO₂
(d) BaO₂ > O₃ > OF₂ > KO₂

Question. Oxidation numbers of P in PO₄ ^3– , of S in SO²⁻₄ and that of Cr in Cr₂O²⁻₇are respectively                         
(a) + 3, + 6 and + 5
(b) + 5, + 3 and + 6
(c) – 3, + 6 and + 6
(d) + 5, + 6 and + 6

Question. When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from                           
(a) zero to +1 and zero to –5
(b) zero to –1 and zero to +5
(c) zero to –1 and zero to +3
(d) zero to +1 and zero to –3

Question. Which of the following arrangements represent increasing oxidation number of the central atom?             
(a) CrO−2 ,ClO−3 ,CrO2−4 ,MnO−4 
(b) ClO−3 ,CrO2−4 ,MnO−4 ,CrO−2 
(c) CrO−2 ,ClO−3 ,MnO−4 ,CrO2−4
(d) CrO2−4 ,MnO−4 ,CrO−2 ,ClO−3 

Question. Which of the following act as reducing agents ? (i) PO₄³⁻ (ii) SO₃ (iii) PO₃²⁻ (iv) NH₃                         
(a) (i), (ii) and (iii)
(b) Only (iii)
(c) (i), (iii) and (iv)
(d) (iii) and (iv)

Question. In the reaction shown below, oxidation state of the carbon in reactant and product are (i) and (ii) respectively? Is the given reaction a redox reaction? Na₂CO₃(aq) + HCl (aq) →NaΘ (aq) + Cl− (aq) + H₂O(l)+ CO_2(g)                           
(a) (i) 6, (ii) 4, yes
(b) (i) 6, (ii) 6, No
(c) (i) 4, (ii) 4, No
(d) (i) 4, (ii) 4, yes

Question. What products are expected from the disproportionation reaction of hypochlorous acid?                           
(a) HCl and Cl₂O
(b) HCl and HClO₃
(c) HClO₃ and Cl₂O
(d) HClO₂ and HClO₄

Question. In the disproportionation reaction 3 HClO₃→ HClO₄ + Cl2 + 2O₂ + H₂O, the equivalent mass of the oxidizing agent is (molar mass of HClO3 = 84.45)                         
(a) 16.89
(b) 32.22
(c) 84.45
(d) 28.15

Question. In the balanced chemical reaction IO⁻₃ aI −bH+→ cH₂O dI₂  a, b, c and d respectively corresponds to       
(a) 5, 6, 3, 3
(b) 5, 3, 6, 3
(c) 3, 5, 3, 6
(d) 5, 6, 5, 5

Question. If equal volume of reactants are used, than no. moles of KMnO4 (moles per liter) used in acidic medium required to completely oxidises the 0.5 M FeSO₃?                   
(a) 0.3
(b) 0.1
(c) 0.2
(d) 0.4

Question. Acidic medium used in KMnO₄ can be made from which of the following acids?                     
(a) HCl
(b) H₂SO₄
(c) HI
(d) HBr

Question. If rod of a metal (x) is put in a metal ion solution which is blue in colour , solution turn colorless. The metal rod and solution respectively are?                   
(a) Zinc and Cu(II)
(b) Zinc and Ni(II)
(c) Aluminium and Cu(II)
(d) Both (a) and (c)

Question. Oxidation is :
(a) Gain of electrons
(b) Loss of neutrons
(c) Loss of electrons
(d) Decrease in positive valency

Question. Oxidation number of Os in OsO₄ :           
(a) + 2
(b) + 4
(c) + 8
(d) + 10

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