Redox Reactions & Electrochemistry Test Online MCQs

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

2. Which shows electrical conductance?

3. Which of the following molecules can act as an oxidizing as well as a reducing agent?

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

5. The oxidation number of sulphur in H₂S₂O₇ is:

6. For reducing one mole of Cr₂O²⁻₇ to Cr³⁺ the charge required is:

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

8. The oxidation states of sulphur in S₈,S₂F₂, H₂s respectively, are

9. Which cannot displace hydrogen from its compound

10. Both oxidation and reduction takes place in:

11. 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?

12. Ostwald’s dilution law is applicable on:

13. Which is Lewis acid?

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

15. In the reaction I₂ + I⁻ → I₃⁻, the Lewis base is: