The conductivity of centimolar solution of KCI at 25°C is 0.0210 ohm-1cm-1 and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of the cell constant is :
The cell constant l = k x R Given: k (conductivity) = 0.0210 ohm-1cm-1 R (resistance) = 60 ohms Then - l = 0.0210 ohm-1cm-1 x 60 ohms I = 1.26 cm-1 The correct option is (B): 1.26 cm-1
An electrochemical cell is a device that is used to create electrical energy through the chemical reactions which are involved in it. The electrical energy supplied to electrochemical cells is used to smooth the chemical reactions. In the electrochemical cell, the involved devices have the ability to convert the chemical energy to electrical energy or vice-versa.
Classification of Electrochemical Cell:
Cathode
Denoted by a positive sign since electrons are consumed here
A reduction reaction occurs in the cathode of an electrochemical cell
Electrons move into the cathode
Anode
Denoted by a negative sign since electrons are liberated here
An oxidation reaction occurs here
Electrons move out of the anode
Types of Electrochemical Cells:
Galvanic cells (also known as Voltaic cells)
Chemical energy is transformed into electrical energy.
The redox reactions are spontaneous in nature.
The anode is negatively charged and the cathode is positively charged.
The electrons originate from the species that undergo oxidation.
Electrolytic cells
Electrical energy is transformed into chemical energy.
The redox reactions are non-spontaneous.
These cells are positively charged anode and negatively charged cathode.
