The two phenomenon associated with Debye-Hiickel theory are:

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

Answer 1

CONCEPT:

Debye-Hückel Theory

The Debye-Hückel theory explains the behavior of electrolyte solutions, particularly the deviation of their activities from ideal behavior.
Two important phenomena associated with this theory are:
- Relaxation Effect: This refers to the time-dependent adjustment of the ionic atmosphere around a central ion due to its movement. When an ion moves, the surrounding ionic atmosphere takes time to reorganize, creating a "relaxation effect" which influences the interaction between ions.
- Electrophoretic Effect: This occurs when ions in solution move in response to an external electric field. The movement of ions creates a drag on surrounding solvent molecules, which influences the mobility of ions and contributes to non-ideal behavior.

EXPLANATION:

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Debye-Hückel theory is crucial for understanding the properties of electrolyte solutions and their deviation from ideality.
Relaxation effect and electrophoretic effect – Both phenomena are integral to Debye-Hückel theory and are correctly associated with it.
Therefore, Option 4 is the correct answer.

Hence, the phenomena associated with Debye-Hückel theory are relaxation effect and electrophoretic effect.