Question

A reversible galvanic cell is connected to an external battery. If the EMF of the battery is less than the EMF of the galvanic cell, then the current:
A.will not pass through the circuit
B.will flow from the battery to the galvanic cell
C.will flow from the galvanic cell to the battery
D.can flow in any direction

Answer 1

Hint:
When the same amount of electricity is passed through different kinds of electrolyte solutions then a reversible galvanic cell is connected to an external battery.
EMF which is the electromotive force of a battery is the energy of the system per unit electric charge which is given generally out by an energy source, such as the battery.

Complete answer:
Let me define few simple terms
The electromotive force of a cell (EMF) of a cell is the maximum potential difference between $2$ electrodes of a cell. It can also be stated as the net voltage between the oxidation and reduction half-reactions. The electromotive force of a cell (EMF) is mainly used to determine whether an electrochemical cell is galvanic or not.
An electromotive cell (EMF) that states electrical energy from spontaneous redox reactions taking place within the cell is known as galvanic cell.
If the electromotive force (EMF) of a battery is less than the EMF of an electro-chemical cell, then current will flow from the electro-chemical cell to the battery. As, the current always flows from a higher potential to a lower potential. So the flow of current will be from galvanic cell to the battery, as the potential of galvanic cells is high so current will flow from higher to lower concentration of potential.
Hence correct answer would be option C.

Additional information:
An electrochemical cell that states electrical energy from spontaneous redox reactions taking place within the cell.
When the battery is used in the device it is a galvanic cell function (with the help of redox energy to produce electricity). When the battery is charging it is an electrolytic cell function (using outside electricity to reverse the completed redox reaction).
When a metal electrode is dipped in a solution containing its own ions, a potential difference is set up across the interface. This potential difference is called the electrode potential.

Note:In an electric system, the flow of current is always opposite to the flow of electrons, in other words, the flow of current is in the opposite direction of the flow of electrons.
As, the current always flows from a higher potential to a lower potential, so if the electromotive force of a battery is less than that of the EMF of an electro-chemical cell, then current will flow from the electro-chemical cell to the battery.