Heating & Chemical Effects of Current

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What is the relationship between the mass of ions liberated and the chemical equivalent according to Faraday's second law of electrolysis?

m ∝ 1/E

m = constant × E

m ∝ E (correct)

m = constant/E

What type of cell has irreversible chemical reactions and cannot be recharged?

Secondary cell

Lead accumulator

Dry cell

Primary cell (correct)

What is the relationship between the electrochemical equivalent and the valency of an ion?

E = A/V (correct)

E = V/A

E = V

E = A × V

What is the main difference between a primary cell and a secondary cell?

The reversibility of the chemical reaction Signup and view all the answers

What is the name of the cell that stores electrical energy as chemical energy and can be recharged?

Secondary cell Signup and view all the answers

What is the physical quantity that the electrochemical equivalent represents?

Mass of a substance deposited per unit electric charge Signup and view all the answers

In a secondary cell, what is the condition for maximum power dissipation in the external circuit?

The efficiency of the cell is 50% Signup and view all the answers

What is the relationship between the mass of a substance deposited, the electrochemical equivalent, and the electric current in electroplating?

m = Zi / At Signup and view all the answers

What is the purpose of a thermocouple, in terms of heat energy?

To convert heat energy into electrical energy Signup and view all the answers

What is the term for the ratio of the output power of a cell to the input power, expressed as a percentage?

Efficiency Signup and view all the answers

What is the physical significance of the Faraday constant?

It is a measure of the amount of substance liberated or deposited per unit electric charge. Signup and view all the answers

What is the primary cause of local action in zinc electrodes?

The presence of impurities on the surface of zinc. Signup and view all the answers

What is the purpose of amalgamating zinc rods with mercury?

To prevent local action by removing impurities. Signup and view all the answers

What is the result of polarisation in a voltaic cell?

The weakening of the action of the cell. Signup and view all the answers

What is the electrochemical equivalent of a substance?

The amount of substance reacted or formed per unit of electric charge. Signup and view all the answers

What is the relationship between the temperature difference and the heat released or absorbed in Thomson's effect?

H ∝ Δθ Signup and view all the answers

What is the unit of Thomson's coefficient?

Joule/coulomb°C Signup and view all the answers

Which of the following effects is observed when a current flows through a conductor with a unit temperature difference?

Thomson's effect Signup and view all the answers

What is the direction of heat flow in a positive Thomson's effect?

From hotter end to colder end Signup and view all the answers

What is the principle behind the working of a thermocouple?

Seebeck effect Signup and view all the answers

Which of the following metals exhibits a positive Thomson's effect?

Zinc Signup and view all the answers

What is the application of thermopiles?

To detect heat radiation Signup and view all the answers

Which of the following metals shows a positive Thomson's effect?

Cu Signup and view all the answers

What is the purpose of a thermopile?

To detect heat radiation Signup and view all the answers

What is the Peltier effect used for?

To cool one end and heat the other end Signup and view all the answers

What is the effect in which a temperature difference between two junctions produces an electric current?

Seebeck effect Signup and view all the answers

What is the effect in which an electric current produces a temperature difference between two junctions?

Peltier effect Signup and view all the answers

What is the effect in which a temperature difference along a conductor produces a voltage?