Balancing Redox Reactions, Class 11 Chemistry NCERT Solutions

1. There will be total 10  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. To balance the oxygen atom in the given reaction in acidic medium
Cr₂O₇^2- (aq) → Cr³⁺(aq)  we

 Add water (H₂O) on right side

 Add water (H₂O) on left side

 Add O on right side

  Add O on left side

Question 1 of 10

2. The oxidation half reaction for following reaction is
Fe²⁺(aq) + Cr₂O₇^2-(aq) → Fe³⁺ (aq) + Cr³⁺(aq)

  Fe³⁺(aq) → Fe²⁺ (aq)

 Cr₂O₇^2-(aq) → Cr³⁺(aq)

 Cr³⁺(aq) → Cr₂O₇^2-(aq)

 Fe²⁺ (aq) → Fe³⁺(aq)

Question 2 of 10

3. In this method, the two half equations are balanced separately and then added together to give balanced equation

 Reluctant method

 Oxidizing agent method

  Reducing agent method

 Half reaction method

Question 3 of 10

4. The process in which the strength of an unknown solution is calculated using a known standard solution.

 Titration

 Oxidation

 Reduction

 None of these

Question 4 of 10

5. For the redox reaction

MnO₄^– + C₂O₄^2- + H⁺ → Mn²⁺ + CO₂ + H₂O
The correct coefficients of the reactants for the balanced reaction are:

 MnO₄^– C₂O₄^2-   H⁺ 16   5   2

 MnO₄^– C₂O₄^2- H⁺ 2 16 5

 MnO₄^– C₂O₄^2- H⁺ 2 5 16

 MnO₄^– C₂O₄^2- H⁺ 5 16 2

Question 5 of 10

6. To balance the charge in the oxidation on half reaction Fe²⁺ (aq) →  Fe³⁺ (aq)

 We add two electrons on reactant side

 We add an electron on product side

 We add an electron on reactant side

 We add two electrons on product side

Question 6 of 10

7. Balanced ionic equation for the reaction of Potassium Dichromate (VI) K₂Cr₂O₇ with Sodium Sulphite Na₂SO₃ in acid solution to give Chromium (III) ion and sulphate ion is

 A

 B

 C

 D

Question 7 of 10

8. To balance H in Cr₂O₇^2- (aq) → Cr³⁺(aq) + 7H₂O (in acidic medium) , we

  Add 4H⁺ on left side

 Add 14H⁺ on right side

 Add 4H⁺ on right side

 Add 14H⁺ on left side

Question 8 of 10

9. How many electrons are transferred during following change:
2I^–(aq) → I₂ (s)

 2 electrons

 1 electron

 4 electrons

 0 electrons

Question 9 of 10

10. In the following reaction

3Br₂ + 6CO₃^2- + 3H₂O 5Br ^– + BrO₃^– + 6HCO₃^–

 Bromine is reduced as well as oxidized

 Bromine is reduced, carbonate is oxidized

 Bromine is neither reduced nor oxidized

 Bromine is oxidized, carbonate is reduced

Question 10 of 10

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