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Electrochemical Cells: Definition and Types

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Electrochemical Cells: Definition and Types

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Questions and Answers

What is the primary function of a potentiometer?

To impose current from an outer source to the cell

To cause chemical change in the cell

To measure electromotive force without withdrawing any current from the cell (correct)

To measure electromotive force by withdrawing current from the cell

What is the condition required to measure the equilibrium potential of a system using a potentiometer?

At minimum voltage

At maximum current

At maximum voltage

At zero current (correct)

What is the purpose of the slid wire in a potentiometer?

To vary the voltage of the cell

To vary the fraction of the known source voltage applied to the cell (correct)

To measure the current flowing through the galvanometer

To connect the galvanometer to the cell

What is the function of a salt bridge in a potentiometer?

To connect the two halves of the cell without mixing ions Signup and view all the answers

What is the purpose of blocking the ends of the salt bridge with cotton wool or gelatin?

To prevent ions from passing between the two halves of the cell Signup and view all the answers

What is the term for the potential developed between the two boundaries of the junction at the two ends of the salt bridge?

Liquid junction potential Signup and view all the answers

What is the purpose of the galvanometer in a potentiometer?

To detect when the source voltage equals the cell voltage Signup and view all the answers

What is the condition required for the potentiometer to measure the voltage of the cell?

When the source voltage equals the cell voltage Signup and view all the answers

What is the purpose of the known voltage source in a potentiometer?

To provide a reference voltage to compare with the cell voltage Signup and view all the answers

What is the shape of the salt bridge in a potentiometer?

Bent tube or inverted U shape tube Signup and view all the answers