Primary Cell (CHE 9)

With respect to recharging a primary or secondary cell, of the following statements, which one is correct?

• The secondary cell can be recharged by passing current through it in the proper direction

• The primary cell can be recharged by passing current through it in the proper direction

• The secondary cell can only be recharged by changing the electrodes

• The primary cell can only be recharged by changing the electrolyte

Which of the following is primary cell:

• Lead Acid Cell

• Carbon-Zinc cell

• Nickel Cadmium Cell

• Silver Zinc Cell

What term is given to the process that takes place inside a cell?

• Electromagnetic action

• Piezoelectric action

• Electromechanical action

• Electrochemical action

The reaction occurring at the cathode of one primary cell is: 2MnO₂(s) + H₂O(l) + 2e^- --> Mn₂O₃(s) + 2OH⁻(aq). During this reaction, the oxidation state of the manganese is changing from ...

• +4 to +2 as manganese is oxidised.

• +4 to +3 as manganese is oxidised.

• +4 to +3 as manganese is reduced.

• +4 to +2 as manganese is reduced.

The cell reaction occurring during discharge of a cell is shown by the equation below.

Ag₂O(s) + Zn(s) + H₂O --> 2Ag(s) + Zn(OH)₂(s)

In this cell, zinc forms the ...

• negative electrode and is oxidised.

• positive electrode and is oxidised.

• negative electrode and is reduced.

• positive electrode and is reduced.

What causes negative ions to be attracted to the cathode of a primary cell while the cell is discharging?

• A negative charge caused by a loss of electrons

• A negative charge caused by an excess of electrons

• A positive charge caused by a loss of electrons

• A positive charge caused by an excess of electrons

Of the following characteristics, which one describes the mercury cell?

• It is physically one of the largest cells

• It has a very stable output voltage

• It produces a large amount of current but has a short shelf life

• It is designed to be rechargeable

As the cell starts discharging its internal voltage decreases:

• True

• False

The followings are the uses of dry cell except:

• Remote controller

• Torch

• Radio

• Car battery

Dry cells are connected in parallel in order to increase the:

• Efficiency

• Current Capacity

• Life of the cells

• Voltage rating