Question

A salt bridge:
(A) is not used in a galvanic cell
(B) completes the circuit
(C) increases the rate of reaction
(D) provides an easy handle to carry the cell
(E) None of these

Answer 1

Hint :In order to answer this question, to know the correct option regarding a salt bridge, we will go through the whole concept and the working mechanism of a salt bridge and we will also explain the implements or the need of the salt bridge.

Complete Step By Step Answer:
A salt bridge completes the circuit. A salt bridge connects two half cells. It helps in flow of ions between two half cells. A salt bridge maintains an electrical neutrality.
A salt bridge is a sort of laboratory equipment that connects the reduction and oxidation halves of an electrochemical cell using a weak electrolyte. To put it another way, it's a connection between the anodic and cathodic compartments in a cell or electrolytic solution.
A salt bridge is a mixture of two non-covalent interactions in chemistry: hydrogen bonding and ionic bonding. In chemistry, biological systems, diverse materials, and various applications such as ion pair chromatography, ion pairing is one of the most important noncovalent forces. It is a regularly seen contribution to the entropically favorable folded conformation's stability. Despite the fact that non-covalent contacts are known to be weak, tiny stabilising interactions can build together to make a significant impact to a conformer's overall stability. Salt bridges can be discovered in proteins as well as supramolecular chemistry. The thermodynamics of each are investigated using experimental approaches to determine the salt bridge's contribution to the overall free energy of the state.
In electrochemical cells, there are primarily two types of salt bridges. They are typically electrolyte-filled U-shaped tubes. Sodium Chloride $ \left( {NaCl} \right) $ , Potassium Chloride $ \left( {KCL} \right) $ , Potassium Nitrate $ \left( {KN{O_3}} \right) $ is generally used electrolyte.
Hence, the correct option is (B) completes the circuit.

Note :
As a result, a salt bridge serves to prevent the accumulation of positive and negative charges surrounding the corresponding electrodes, allowing for a smooth reaction to occur. It also contributes to the smooth passage of electrons.