Question

In a galvanometer cell if salt bridge is replaced by inert platinum sheet, the cell will
(A) not work further; as positive and negative charges will accumulate on respective sides
(B) produce less potential; as platinum performs poorly as salt-bridge
(C) work as previous; as platinum performs will as salt-bridge
(D) produce more potential; as platinum performs greatly as salt-bridge

Answer 1

Salt bridge is defined as a device that is used to provide electrical contact between two solutions i.e. A tube used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell), a type of electrochemical cell.

Complete step by step answer:
A galvanometer is an electromechanical instrument used for detecting and indicating an electric current. A galvanometer works as an actuator, by producing a rotary deflection (of a "pointer"), in response to electric current flowing through a coil in a constant magnetic field. Early galvanometers were not calibrated, but their later developments were used as measuring instruments, called ammeters, to measure the current flowing through an electric circuit.
The compartments containing the electrode and the solution of the electrolyte are called half cells. When the two compartments are connected by a salt bridge and the electrodes are joined by a wire through a galvanometer the electricity begins to flow. This is the simple form of a voltaic cell.
In a galvanometer cell if salt bridge is replaced by inert platinum sheet, not work further; as positive and negative charges will accumulate on respective sides
Metal like Platinum can be used as it is inert and supplies only electrons, but it cannot be used for cases where there is possibility of reaction with electrolyte.
So, the correct answer is “Option A”.

Note: The chemical reaction responsible for production of electricity takes place in two separate compartments. Each compartment consists of a suitable electrolyte solution and a metallic conductor. The metallic conductor acts as electrode.