Question

The electrolyte used for salt bridge should consist of :

• A. cations and anions having same mobility
• B. cations having higher mobility than that of anions.
• C. cations having lower mobility than that of anions.
• D. None of the above

Answer 1

The correct option is A cations and anions having same mobility

Salt bridge is a U–shaped inverted tube that contains a gel (paste of agar-agar powder) permeated with an inert electrolyte.
The criteria for an electrolyte to be used in salt bridge are :
1. The electrolytes should consist of cations and anions having same mobility.
2. The electrolytic ions should not react with the ions in the solution.
3. The electrolyte should not get oxidised/reduced at electrodes.