MCQs for Chemistry Class 11 with Answers Chapter 8 Redox Reactions
Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry Redox Reactions with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination
Chapter 8 Redox Reactions MCQ with Answers Class 11 Chemistry
MCQ Questions Class 11 Chemistry Redox Reactions provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.
Question. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
Question. Six moles of Cl2 undergo a loss and gain of 10 moles of electrons to form two oxidation states of Cl in an autoredox change. What are the two oxidation states of Cl in this change?
(a) +5, − 1
(b) +7, − 1
(c) +3, 0
(d) +3, − 1
Question. Which one of the following cannot function as an oxidising agent?
(c) NO3− (aq)
Question. In which of the following, the oxidation number of oxygen has been arranged in increasing order?
(a) BaO2 < KO2 < O3 < OF2
(b) OF2 < KO2 < BaO2 < O3
(c) BaO2 < O3 < OF2 < KO2
(d) KO2 < OF2 < O3 < BaO2
Question. The oxidation numbers of phosphorus in Ba(H2P2O2) and xenon in Na4XeO6 respectively are
(a) +3 and +4
(b) +2 and +6
(c) +1and +8
(d) −1and −6
Question. In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
(a) N O2 and N2O4
(b) P2O5 and P4O10
(c) N2Oand NO
(d) SO2 and SO3
Question. The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following 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 fluorine is −1
Question. The largest oxidation number exhibited by an element depends on its outer electronic configuration.With which of the following outer electronic configurations, the element will exhibit largest oxidation number?
(a) 3d1 4s2
(b) 3d3 4s2
(c) 3d5 4s1
(d) 3d5 4s2
Question. In which of the following compounds, an element exhibits two different oxidation states?
Question. In the reaction,
3Br2 + 6CO32− + 3H2O → 5Br− +BrO−3 + 6HCO3−
(a) bromine is oxidised and the carbonate radical is reduced
(b) bromine is reduced and the carbonate radical is oxidised
(c) bromine is neither reduced nor oxidised
(d) bromine is both reduced and oxidised
Question. MnO4− is a good oxidising agent in different medium changing to
MnO4− → Mn2+ → MnO42−→ MnO2 → Mn2O3
Change in oxidation number respectively, are
(a) 1, 3, 4, 5
(b) 5, 4, 3, 2
(c) 5, 1, 3, 4
(d) 2, 6, 4, 3
Question. When SO2 is passed through an acidified solution of potassium dichromate, the oxidation state of S changes from
(a) + 4 to 0
(b) + 4 to +2
(c) + 4 to +6
(d) + 6 to +4
Question. In which of the following reactions, hydrogen is acting as an oxidising agent ?
(a) With iodine to give hydrogen iodide
(b) With lithium to give lithium hydride
(c) With nitrogen to give ammonia
(d) With sulphur to give hydrogen sulphide
Question. The compound that can work both as an oxidising as well as reducing agent is
(c) Fe2 (SO4)
Question. The oxidation number of sulphur in S8, S2F2 and H2S respectively are
(a) 0, +1and −2
(b) +2, +1and −2
(c) 0, + 1 and + 2
(d) −2, + 1 and − 2
Question. The difference in the oxidation numbers of the two types of sulphur atoms in Na2S4O6 is
Question. Oxidation states of the metal in the minerals haematite and magnetite, respectively are
(a) II, III in haematite and III in magnetite
(b) II, III in haematite and II in magnetite
(c) II in haematite and II, III in magnetite
(d) III in haematite and II, III in magnetite
Question. Among the properties A reducing, B oxidising and C complexing, the set of properties shown by CN− ion towards metal species is
(c) C, A
Question. In which of the compounds does manganese exhibit highest oxidation number?
Question. Which order of compounds is according to the decreasing order of the oxidation state of nitrogen?
(a) HNO3 , NO, NH4Cl, N2
(b) HNO3 , NO,N2 , NH4Cl,
(c) HNO3 , NH4Cl, NO, N2
(d) NO, HNO3 , NH4Cl,, N2
Question. Which of the following is a redox reaction?
(a) Formation of glucose from CO2 and water
(b) Reaction of potassium cyanide with silver cyanide
(c) Hydration of rubidium
(d) Reaction of barium chloride with sulphuric acid
Question. Thiosulphate reacts differently with iodine and bromine in the reactions given below:
2S2O2−3 + I2 → S4O2−6 + 21−
S2O2−3 + 2Br2 + 5H2O → 2SO2−4 2Br− + 10H+
Which of the following statements justifies the above dual behaviour of thiosulphate?
(a) Bromine is a stronger oxidant than iodine
(b) Bromine is a weaker oxidant than iodine
(c) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions
(d)Bromine undergoes oxidation and iodine undergoes reduction in these reactions
Question. For the reaction betweenMnO4− and C2O42– in basic solution, the unbalanced equation is
MnO–4 + C2O2–4 → MnO2 + CO2
In a balanced equation, the number of OH– ions is
(b) 8 on the right
(c) 4 on the left
(d) 2 on the left
Question. C2H6 (g) +nO2 → CO2(g) + H2O(∫)
In this equation, ratio of the coefficients of CO2 and H2O is
(a) 1 : 1
(b) 2 : 3
(c) 3 : 2
(d) 1: 3
Question. Given, x Na2HAsO3 + y NaBrO3 +Z HCl →
NaBr + H3AsO4 + NaCl
The value of x, y and z in the above redox reaction respectively are
(a) 2, 1, 2
(b) 2, 1, 3
(c) 3, 1, 6
(d) 3, 1, 4
Question. Consider the following reaction,
x MnO4− + y C2O2−4 + zH+ → xMn2+ + 2y CO2 + Z/2 H2O
The values of x, y and z in the reaction respectively are
(a) 2, 5 and 8
(b) 2, 5 and 16
(c) 5, 2 and 8
(d) 5, 2 and 16
Question. In a reaction, 4 moles of electrons are transferred to 1 mole of HNO3. The possible product obtained due to reduction is
(a) 0.5 mole of N2
(b) 0.5 mole of N2O
(c) 1 mole of NO2
(d) 1 mole of NH3
Question. Which of the following is a redox reaction?
(a) NaCl + KNO3 → NaNO3 KCl
(b) CaC2O4 + 2HCl → CaCl2 + H2C2O4
(c) Ca(OH)2 + 2NH4Cl → CaCl2 + 2NH3 + 2H2O
(d) 2K[Ag(CN)2 ] + Zn → 2Ag K2 [Zn(CN)4 ]
Question. For the redox reaction,
MnO−4 C2O2−4 + H+ → Mn2+ + CO2 + H2O
the correct coefficients of the reactants for the balanced reaction are
MnO4− C2O42− H+
(a) 2 5 16
(b) 16 5 2
(c) 5 16 2
(d) 2 16 5
Question. When the following half-reaction is balanced
CN− → CNO−
Which of the following statements is true regarding the balance half-reaction?
(a) Carbon is losing two electrons per atom
(b) Oxidation number of carbon increases from +1 to +3
(c) Oxidation number of nitrogen remains constant
(d) Statements (a) and (c) both are true
Question. For the following reaction, consider the following statements
2Cr(OH)3 + 3H2O2 + 4OH− → 2CrO2−4 + 8H2O
I. there is colour change from green precipitate to yellow coloured solution.
II. oxidation number of Cr changes from +3 to +6.
III. oxidation number of O in H2O2 changes from –2 to –1. Select the correct statement(s).
(a) Only I
(b) Both I and II
(c) Only II
(d) Both I and III
Question. Oxidation states of X, Y, Z are +2 +5 and –2 respectively. Formula of the compound formed by these will be
Question. Assertion (A) Oxidation number of chromium in CrO5 is + 6.
Reason (R) Oxidation number of each oxygen atom is –1.
(a) Assertion and Reason both are correct statements and Reason is the correct explanation of the Assertion
(b) Assertion and Reason both are correct statements but Reason is not the correct explanation of the Assertion
(c) Assertion is correct and Reason is incorrect
(d) Both Assertion and Reason are incorrect
Question. Which of the following statements is not correct?
(a) The oxidation number of S in (NH4 )2S2O8 + 6
(b) The oxidation number of Os inOsO4 is + 8
(c) The oxidation number of S in H2SO5 is + 8
(d) The oxidation number of O in KO2 is − 1/2
Question. I– reduces IO3 – to I2 and itself oxidised to I2 in acidic medium. Final reaction is
(a) I– + IO–3 + 6H+ → I2 + 3H2O
(b) I– + IO–3 → I2 + O3
(c) 5I– + IO–3 + 6H+ → 3I2 + 3H2O
(d) None of the above
Question. Which of the following is not a reducing agent?
Question. In which of the following reaction, nitric oxide acts as a reducing agent?
(a) 4NH3 + 5O2 → 2NO + 6H2O
(b) 2NO + 3I2 + 4H2O → 2NO−3 + 6I−+ 8H+
(c) 2NO + H2SO3 → N2O + H2SO4
(d) 2NO + H2S → N2O + S + H2O
We hope the above multiple choice questions for Class 11 Chemistry for Chapter 8 Redox Reactions provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Redox Reactions is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for the benefits of class 11 students. Please go through these and let us know if you have any feedback in the comments section.