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Objective Type Questions and Answers for Class 11 Chemistry Chapter 8 Redox Reactions

Questions
1 Which among the following is the strongest oxidising agent?
A H2O2
B O3
C K2Cr2O7
D KMnO4

Answer:O3
2 Which among the following compounds is the most reducing compound?
A H2S
B HNO2
C SnCl2
D H2SO3

Answer:H2S
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3 In which of the following complex, the oxidation number of Fe is +1?
A Fe4[Fe(CN)6]3
B [Fe(H2O)5NO]SO4
C [FeBr4]–
D [Fe(H2O)6]2-

Answer:[Fe(H2O)5NO]SO4
4 Find the oxidation state of I in H4IO6–
A +7
B +5
C +1
D -1

Answer:+7
5 Find the redox reaction
A In the atmosphere, O3 from O2 by lighting
B The reaction of H2SO4 with NaOH
C Both oxidation and reduction reaction
D Evaporation of water

Answer:Both oxidation and reduction reaction
6 During a reaction of oxalic acid, potassium chlorate and sulphuric acid, the oxidation number of which of the element undergoes a maximum change
A H
B S
C C
D cl

Answer:cl
7 H2SO4 acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?
A C + 2H2SO4 → CO2 + 2SO2 + 2H2O
B CaF2 + 2H2SO4 → CaSO4 + 2HF
C S + 2H2SO4 → 3SO2 + H2O
D Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

Answer:CaF2 + 2H2SO4 → CaSO4 + 2HF
8 H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is
A +6
B +5
C -10
D +3

Answer:+6
9 One mole of ferrous oxalate requires____ moles of MnO4– to get oxidised completely in an acidic medium
A 0.6 moles
B 0.4 moles
C 0.2 moles
D 7.5 moles

Answer:0.4 moles
10 Which of the compounds can exist together?
A HgCl2, SnCl2
B FeCl3, KI
C FeCl3, SnCl2
D FeCl2, SnCl2

Answer:FeCl2, SnCl2
11 In the following questions, a statement of assertion (A) followed by a statement of the reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Redox couple is the combination of the oxidised and reduced form of a substance involved in an oxidation or reduction half cell.

Reason (R) : In the representation E° Fe3+/fe2+and E°cu2+/cu , Fe3+ / Fe2+ and Cu2+ are redox couples.

A Both A and R are true and R is the correct explanation of A.
B Both A and R are true but R is not the correct explanation of A.
C A is true but R is false.
D Both A and R are false

Answer:Both A and R are true but R is not the correct explanation of A.
12 Assertion (A): The decomposition of hydrogen peroxide to form water and oxygen is an example of a disproportionation reaction.

Reason (R): The oxygen of peroxide is in –1 oxidation state and it is converted to zero oxidation state in O2 and –2 oxidation state in H2O.

A Both A and R are true and R is the correct explanation of A.
B Both A and R are true but R is not the correct explanation of A.
C A is true but R is false.
D Both A and R are false.

Answer:Both A and R are true and R is the correct explanation of A.
13 Assertion (A): In the reaction between potassium permanganate and potassium iodide, permanganate ions act as an oxidising agent.

Reason (R): Oxidation state of manganese changes from +2 to +7 during the reaction.

A Both A and R are true and R is the correct explanation of A.
B Both A and R are true but R is not the correct explanation of A.
C A is true but R is false.
D Both A and R are false.

Answer:A is true but R is false.
14 Assertion (A): Among halogens, fluorine is the best oxidant.

Reason (R): Fluorine is the most electronegative atom.

A Both A and R are true and R is the correct explanation of A.
B Both A and R are true but R is not the correct explanation of A.
C A is true but R is false.
D Both A and R are false.

Answer:Both A and R are true but R is not the correct explanation of A.
15 Which of the following electrodes will act as anodes, when connected to Standard Hydrogen Electrode?
A Al/Al2+ -E\degree = –1.66
B Fe/Fe2+ -E\degree = – 0.44
C Cu/Cu2+ -E\degree= + 0.34
D F2 (g)/2F- (aq) -E\degree= + 2.87

Answer:A, B
16 Identify the correct statements with reference to the given reaction

P4 + 3OH–+ 3H2O → PH3+ 3H2PO2–

A Phosphorus is undergoing reduction only.
B Phosphorus is undergoing oxidation only.
C Phosphorus is undergoing oxidation as well as reduction.
D Hydrogen is undergoing neither oxidation nor reduction.

Answer:C, D
17 The exhibition of various oxidation states by an element is also related to the outer orbital electronic configuration of its atom. Atom(s) having which of the following outermost electronic configurations will exhibit more than one oxidation state in its compounds.
A 3s1
B 3d1 4s2
C 3d2 4s2
D 3s2 3p3

Answer:C, D
18 identify the correct statement (s) with the following reaction:

Zn + 2HCl → ZnCl2 + H2

A Zinc is acting as an oxidant
B Chlorine is acting as a reductant
C Hydrogen ion is acting as an oxidant
D Zinc is acting as a reductant

Answer: C, D
19 Which of the following statement(s) is/are not true about the following decomposition reaction.

2KClO3 → 2KCl + 3O2

A Potassium is undergoing oxidation
B Chlorine is undergoing oxidation
C Oxygen is reduced
D None of the species is undergoing oxidation or reduction

Answer:A, D
20 Which of the following elements does not show disproportionation tendency?
A Cl
B Br
C F
D I

Answer:F

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