Which is the weak electrolyte among the below?

Question

Question

This question was previously asked in

DSSSB PGT Chemistry (Female) Official Paper (Held On: 06 Jul, 2018 Shift 1)

Answer 1

CONCEPT:

Electrolytes and Their Strength

Electrolytes are substances that dissolve in water to produce ions, enabling the solution to conduct electricity.
The strength of an electrolyte depends on its degree of ionization or dissociation in water:
- Strong Electrolytes: Completely dissociate into ions in water (e.g., strong acids like HCl, HBr, HI).
- Weak Electrolytes: Only partially dissociate into ions in water (e.g., weak acids like HF).

EXPLANATION:

In the given options:
- HBr, HI, and HCl are strong acids, meaning they completely dissociate in water and are strong electrolytes.
- HF (hydrofluoric acid) is a weak acid because it only partially dissociates in water. The bond between hydrogen and fluorine is quite strong, making it difficult for HF to ionize completely.
Thus, HF is classified as a weak electrolyte compared to the other given acids.

Therefore, the correct answer is option 3 (HF).