Electrochemical cell
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This document contains 20 multiple choice questions about electrochemical cells. It covers topics like the equivalent EMF and internal resistance of series cell combinations, definitions of galvanic cells, electrolytic cells and voltaic cells, the functions of electrodes and salt bridges, and the direction of electron and ion flow in galvanic cells.
![Electrochemical Cell
1.What is the equivalent EMF of a series combination of n cells?
[A] the arithmetic mean of their EMFs
[B] the product of their individual EMF
[C] the sum of their individual EMF
[D] None of the above
2.What is the equivalent internal resistance of a series
combination of n cells?
[A] the arithmetic mean of their internal resistance
[B] the product of their individual internal resistance
[C] the sum of their individual internal resistance
[D] the sum of the reciprocal of their individual internal
resistance
3.What do we call the resistance offered by the electrolyte and
electrodes when the current flows?
[A] External resistance
[B] Internal resistance
[C] Electrolytic power
[D] Electrode Potential](https://image.slidesharecdn.com/electrochemicalcell-200425090528/85/Electrochemical-cell-1-320.jpg)
![Electrochemical Cell
4.Which of these are electrochemical cells?
[A] Galvanic cells
[B] Electrolytic cells
[C] Both a and b
[D] None of the above
5.What do we call a cell that induces a spontaneous redox
reaction to create a flow of electrical charges?
[A] Voltaic cell
[B] Electrolytic cell
[C] Such cells don’t exist
[D] None of the above
6.Which of the following cells is the basis of Non-rechargeable
batteries?
[A] Galvanic cells
[B] Electrolytic cells
[C] Both a and b
[D] None of the above](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Electrochemical cell
- 1. Electrochemical Cell 1.What is the equivalent EMF of a series combination of n cells? [A] the arithmetic mean of their EMFs [B] the product of their individual EMF [C] the sum of their individual EMF [D] None of the above 2.What is the equivalent internal resistance of a series combination of n cells? [A] the arithmetic mean of their internal resistance [B] the product of their individual internal resistance [C] the sum of their individual internal resistance [D] the sum of the reciprocal of their individual internal resistance 3.What do we call the resistance offered by the electrolyte and electrodes when the current flows? [A] External resistance [B] Internal resistance [C] Electrolytic power [D] Electrode Potential
- 2. Electrochemical Cell 4.Which of these are electrochemical cells? [A] Galvanic cells [B] Electrolytic cells [C] Both a and b [D] None of the above 5.What do we call a cell that induces a spontaneous redox reaction to create a flow of electrical charges? [A] Voltaic cell [B] Electrolytic cell [C] Such cells don’t exist [D] None of the above 6.Which of the following cells is the basis of Non-rechargeable batteries? [A] Galvanic cells [B] Electrolytic cells [C] Both a and b [D] None of the above
- 3. Electrochemical Cell 7.What do we call the cell that requires an outside electrical source to drive the non-spontaneous redox reaction? [A] Voltaic cell [B] Electrolytic cell [C] Galvanic cell [D] None of the above 8.What kind of cell is the mobile phone battery when it is being charged? [A] Galvanic cell [B] Fuel cell [C] Electrolytic cell [D] None of the above 9.Which of the following is correct NOT correct about inert electrodes? [A] They serve as source of electrons [B] They take part in the chemical reaction [C] Both a and b [D] None of the above
- 4. Electrochemical Cell 10.Which of the following metals are commonly used as inert electrodes? [A] Platinum [B] Carbon [C] Mercury [D] All of the above 11.What do we call the electrode that can be oxidized or reduced in half reaction? [A] Inert electrode [B] Active electrode [C] Sleeping electrode [D] Passive electrode 12.What is the device used to measure the cell potential? [A] Ammeter [B] Voltmeter [C] Wattmeter [D] None of the above
- 5. Electrochemical Cell 13.What is the role of Salt bridge? [A] allows the ions to flow from one half cell to another [B] prevents the flow of solutions from one half cell to another [C] Both a and b [D] None of the above 14.What do we call the cell that converts the potential energy from a fuel into electricity? [A] Electrolytic cell [B] Galvanic cell [C] Dry cell [D] Fuel cell 15.Which of these is NOT a product of a fuel cell? [A] Water [B] Electricity [C] Heat [D] None of the above
- 6. Electrochemical Cell 16.What do we call a device which generates electric energy using chemical energy? [A] Potentiometer [B] Resistor [C] Cell [D] Metre bridge 17.Which of the following is correct about EMF of a cell? [A] it is the potential difference between the electrodes when current is flowing in the cell [B] it is the drift velocity of the electrons when there is no current in the cell [C] it is the potential difference between the electrodes when there is no current in the cell [D] None of the above 18.What is the substance known as where free ions are present in a cell? [A] Electrodes [B] Electrolyte [C] Coolant [D] None of the above
- 7. Electrochemical Cell 19.What is the direction of current through electrolyte in a galvanic cell? [A] flows from cathode to anode [B] flows from anode to cathode [C] flows in both direction [D] None of the above 20.What is the direction of current through external circuit in a galvanic cell? [A] flows from cathode to anode [B] flows from anode to cathode [C] flows in both direction [D] None of the above