Solution of class 12 test paper 1 electrochemistry ?

Question

Answer

Solution of Class 12 Test Paper 1 Electrochemistry

Section A: Multiple Choice Questions

Answer: D

Answer: C

Answer: B

Answer: A

Answer: D

Answer: C

Answer: B

Answer: A

Answer: D

Answer: C

Section B: Short Answer Questions

Answer: The oxidation state of sulphur in H2SO4 is +6.

Answer: Kohlrausch's law states that the limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation.

Answer: The standard electrode potential of a half-cell is the potential difference between the electrode and the solution when the concentration of the ions in the solution is 1 M and the pressure of the gases is 1 atm.

Answer: A galvanic cell produces electrical energy from a spontaneous redox reaction, while an electrolytic cell consumes electrical energy to drive a non-spontaneous redox reaction.

Answer: The emf of a cell is the potential difference between the two electrodes of the cell when no current is flowing through the cell.

Section C: Long Answer Questions

Answer: The Nernst equation is given as Ecell = E°cell – (RT/nF) lnQ, where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred, F is the Faraday constant, and Q is the reaction quotient. The Nernst equation is used to calculate the cell potential under non-standard conditions.

Answer: The corrosion of iron can be prevented by using various methods such as:
- Coating the surface of iron with a layer of a less reactive metal like zinc or chromium.
- Using sacrificial anodes made of a more reactive metal like magnesium or zinc.
- Using cathodic protection by connecting the iron object to a more reactive metal like magnesium or zinc, which acts as a sacrificial anode.
- Using inhibitors, which are chemicals that prevent or slow down the corrosion reaction by forming a protective layer on the surface of the metal.

Conclusion

In conclusion, the Class 12 Test Paper 1 on Electrochemistry covered topics such as redox reactions, cell potential, electrode potential, and corrosion. The multiple-choice questions tested the student's knowledge of basic concepts, while the short answer and long answer questions

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