Fill in the blanks by choosing the appropriate word/words from those given in the brackets.(dialysis, active, dispersed phase , dispersion medium , free , electro-osmosis , coagulation , coagulates, emulsion , gel , gold number , Tyndall effect , protective colloids , electrodialysis)
Rough surfaces have more.......centres on account of ........ unsatisfied valencies.

Explanation

To fill in the blanks in the statement "Rough surfaces have more ______ centres on account of ______ unsatisfied valencies," we need to analyze the terms provided in the brackets and their relevance to the context of surface chemistry.

1. **Understanding the Context**:
- The question discusses rough surfaces and their properties in relation to adsorption. Rough surfaces increase the surface area available for adsorption, which leads to more active sites for molecules to attach.

2. **Identifying the First Blank**:
- The first blank requires a term that describes the sites available for adsorption on rough surfaces. The appropriate term here is **"active"**. Active sites refer to the locations on a surface where adsorption can occur.

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