1. The standard electrode potential for hydrogen is:
Answer:
Explanation:
By convention, the standard electrode potential for hydrogen is taken as 0.00 V.
2. Which of the following is an oxidation reaction?
Answer:
Explanation:
In the given reaction, iron is losing an electron, which is characteristic of oxidation.
3. The unit of electrical conductivity is:
Answer:
Explanation:
Electrical conductivity is measured in Siemens per meter (S/m).
4. Which cell does not use the process of electrolysis?
Answer:
Explanation:
A galvanic cell generates electricity from a spontaneous chemical reaction, whereas electrolysis requires an external source of electricity.
5. Faraday’s first law of electrolysis relates:
Answer:
Explanation:
Faraday's first law states that the amount of substance deposited is directly proportional to the charge passed through the electrolyte.
6. Which of the following reactions at the cathode will require the highest potential?
Answer:
Explanation:
Aluminum, with its +3 charge, requires the highest potential for reduction among the given options.
7. In a galvanic cell, the direction of electron flow is from:
Answer:
Explanation:
In a galvanic cell, the anode is the site of oxidation, and electrons flow from it to the cathode.
8. Which of the following is true for a concentration cell?
Answer:
Explanation:
In a concentration cell, both the electrodes are of the same material but are in contact with solutions of different concentrations.
9. Nernst equation relates:
Answer:
Explanation:
The Nernst equation relates the electrode potential of a cell to temperature and concentration.
10. Which law states that molar conductivity of an electrolyte at infinite dilution is the sum of molar conductivities of its cations and anions?
Answer:
Explanation:
Kohlrausch’s law of independent migration states the given principle.
11. In an electrolytic cell, cations move towards:
Answer:
Explanation:
Cations are positively charged and move towards the cathode, which is negatively charged.
12. The electrode potential of a half-cell in a galvanic cell depends on:
Answer:
Explanation:
Electrode potential is dependent on temperature, concentration, and pressure as indicated by the Nernst equation.
13. A secondary battery is one that:
Answer:
Explanation:
Secondary batteries can be recharged and used multiple times.
14. In a salt bridge, the electrolyte is generally:
Answer:
Explanation:
A salt bridge typically contains a salt in a gel-like state to maintain electrical neutrality.
15. Electrolysis of water produces:
Answer:
Explanation:
Water breaks down into hydrogen at the cathode and oxygen at the anode.
16. Which metal is used in the hydrogen electrode?
Answer:
Explanation:
Platinum is used in the hydrogen electrode due to its inert nature.
17. The relationship between Gibbs free energy (ΔG) and the emf (E) of the cell is:
Answer:
Explanation:
This relationship shows that the free energy change of a reaction is proportional to the emf of the cell.
18. A higher oxidation potential indicates:
Answer:
Explanation:
Higher oxidation potential means the substance can be easily oxidized, indicating greater reducing power.
19. The most suitable method for the deposition of silver from silver nitrate solution is:
Answer:
Explanation:
Electrolysis can be used to deposit silver from its salt solution.
20. The specific conductance of a solution decreases with:
Answer:
Explanation:
Specific conductance decreases with a decrease in temperature and dilution.