Question

Statement I: \[KCl,NaCl,N{H_4}Cl\] etc cannot be used in the salt bridge of the cell containing silver.
Statement II: a salt bridge contains concentrated solution of an inert electrolyte like \[KCl,KN{O_3},{K_2}S{O_4}\] etc in agar agar.
A. If both the statements are correct and statement II is the correct explanation of the statement I.
B. If both the statements are correct and statement II is not the correct explanation of statement I.
C. If statement I is correct ,but statement II is incorrect.
D. If the statement I is incorrect, but statement II is correct.

Answer 1

Hint: A salt bridge is a U shaped glass tube which contains the electrolytes like \[KCl,KN{O_3},{K_2}S{O_4}\] which is further mixed in some kind of gel like gelatin or agar agar . So talking about the above statements we can say that the above statement is correct which states that the \[KCl,NaCl,N{H_4}Cl\]etc cannot be used in the salt bridge of the cell containing silver .
This is so because the ions need to flow back and forth between the two cells and if silver containing any of the cells is used then there would be the formation of some of the precipitate.

Complete step-by-step answer:
A salt bridge is a U shaped glass tube which contains the electrolytes like \[KCl,KN{O_3},{K_2}S{O_4}\] which is further mixed in some kind of gel like gelatin or agar agar .
 It further plays an important role in working of an electrochemical cell.
These roles of the electrochemical cell can be stated as follows:
Firstly, it completes the circuit.
Secondly, it maintains the electrical neutrality of the solution in each of the half cells.
So talking about the above statements we can say that the above statement is correct which states that the \[KCl,NaCl,N{H_4}Cl\] etc.., cannot be used in the salt bridge of the cell containing silver .
This is so because the ions need to flow back and forth between the two cells and if silver containing any of the cells is used then there would be the formation of some of the precipitate.
But the statement is also correct and it states that the : a salt bridge contains concentrated solution of an inert electrolyte like \[KCl,KN{O_3},{K_2}S{O_4}\] etc in agar agar.
These statements are correct but the second one is not the correct explanation of the first one.

Note: Further we should know that the salt bridge was added in Daniel cell as an improvement.in original cell the electricity stops flowing after some time as positive charge accumulates in oxidation half cell and negative charge in reduction half cell.but when salt bridge is present it provides anion and cation to respective half cells thus maintaining neutrality of both the cells.