Electochemistry

1. Chemical reaction that occurs at anode is

• Oxidation

• reduction

• Redox

• neutralization

2. Calomel is the paste of

• HgCl₂ and Hg 

• Hg₂Cl₂ and Cl^- 

• Hg₂Cl₂ and Hg 

3. Electrolyte used in Nickel- metal hydride battery is

• NiO(OH)

• KOH 

•  LiPF₆ 

• Ni(OH)₂

4. Voltage generated by Li-ion battery is

• 3.6V

• 1.5V 

•  1.3V 

• 2.0V

5. Electrolyte concentration cell is an electrochemical cell where the concentration of the two electrolyte solutions are

•  Same 

• Concentrated

• Different

• Dilute

6. Calculate the emf of a cell at 298K constructed by dipping Zinc rods in 0.001M and 0.5 M ZnSO₄ solution.

• 0.0591V   

• 2.303V 

• 0.76V

• 0.0797V

7. Calculate Standard electrode potential of a cell consisting of Mg and Ag Electrodes. Given E^o_Mg = -2.363V and E^o_Ag = 0.8V

•  3.163V

• -1.563 V

• 1.563 V

• -3.163 V

8. Electochemical cell consists of iron and zinc electrode. E^o_Zn = -0.76V and E^o_Fe = -0.44V.

• Zn acts as anode and Fe acts as cathode

• Zn acts as cathode and Fe acts as anode

• Zn and Fe both acts as anode

• Zn and Fe both acts as anode

9. The potential of Calomel electrode depends on the concentration of

• Hg²⁺ ions  

• Hg

• Hg₂Cl₂

• Cl^- ions

electrochemical cell consists of two half cell having -2.6V and -3.2V. Standard potential of the cell is

• -0.6V

• 0.6V

• 5.8V

• -5.8V