Electrode potential

An electrochemical cell in which fuel gives up electrons at one electrode and oxygen gain electrons at another electrode is known as

• Fuel cell

• Electrolytic cell

• Oxygen cell

• Electrode cell

During electrolysis, the mass of a substance produced is proportional to

• time of constant current only

• strength of current only

• Voltage provided

• time of constant current and strength of current

When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?

• <1

• >1

• =0

• Not defined

When no current is drawn through an electrochemical cell, the sum of the electrode potentials of the two electrodes is called cell emf.

• True

• False

When no current is drawn through an electrochemical cell, the sum of the electrode potentials of the two electrodes is called cell emf.

• True

• False

Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin?

• The jelly acts as an electrolyte

• It helps the electrolytes to mix with the contents of the half cells

• It helps maintain the electrical polarity between the two half-cell solutions

• It keeps the electrolyte in semi-solid phase and prevents it from mixing with the two half-cell solutions

Which of the following is a not a secondary cell?

• Nickel-cadmium cell

• Lead storage cell

• Mercury cell

• Leclanche cell

Salt bridge transfers

• Current

• Anion

• Electrons

• Ions

Temperature for the measurement of standard electrode potential is

• 298 K

• 300 K

• 310 K

• 290 K

Voltaic cell can be recharged by

• by addition of fresh solution

• by replacing external circuit with external source of electricity

• by removal of solution

• by heating it