Redox Reactions & Electrochemistry Test Online MCQs

1. In the following chemical reaction: Ag₂O + H₂O+ 2e⁻ →2Ag + 2OH⁻

2. Through a solution of CuSO₄ a current of 3 amperes was passed for 2 hours. At cathode 3 g of Cu²⁺ions were discharged. The current efficiency is [At. Wt. of Cu = 63.5]

3. Which shows electrical conductance?

4. The emf of Daniell cell at 298 K is E₁’ Zn|ZnSO₄(0.01 M)||CuSO₄(1.0 M)| Cu When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the emf changed to E₂ What is the relation between E₁ and E₂?

5. Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of aluminium ion is:

6. Which of the following reactions is used to make a fuel cell?

7. Which of the following statements is true for the electrochemical Daniel cell?

8. Of the following which change will shift the reaction towards the product? I₂(g)⇌ 21(g), ∆H⁰_r (298 K) = + 150 kJ

9. Equivalent conductance of an electrolyte containing NaF at infinite dilution is 90.1 Ohm⁻¹ cm². If NaF is replaced by KF what is the value of equivalent conductance? 

10. Effect of dilution on conductivity of solution:

11. Both oxidation and reduction takes place in:

12. What is the pH of 0.01 m glycine solution? For glycine, K_a₁ = 4.5 x 10⁻³ and K_a₂ = 1.7 x 10⁻¹⁰ at 298 K?

13. The oxidation states of iodine in HIO₄, H₃IO₅ and H₅IO₆ are respectively

14. The oxidation number of sulphur in H₂S₂O₇ is:

15. Ostwald’s dilution law is applicable on: