Redox Reactions & Electrochemistry Test Online MCQs

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

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

3. Effect of dilution on conductivity of solution:

4. The charge required for the reduction of 1 mol of MnO⁻₄ to MnO₂ is:

5. Ostwald’s dilution law is applicable on:

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

7. Which cannot displace hydrogen from its compound

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

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

10. 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]

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

12. Both oxidation and reduction takes place in:

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

14. Oxidation number of Os in OsO₄:

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