Question

Which of the following is application of adsorption in chemical analysis?

• A. Adsorption indicators
• B. Thin layer chromatography
• C. Qualitative analysis
• D. All of these.

Answer 1

The correct option is D All of these.

Various applications of adsorption are-

• Production of high vacuum: The remaining traces of air can be adsorbed by charcoal from a vessel evacuated by a vacuum pump to give a very high vacuum.
  
• Gas masks: Gas mask consists of activated charcoal or mixture of adsorbents is usually used for breathing in coal mines to adsorb poisonous gases.
  
• Removal of colouring matter from solutions: Animal charcoal removes colours of solutions by adsorbing coloured impurities.
  
• Adsorption indicators: Surfaces of certain precipitates such as silver halides have the property of adsorbing some dyes like eosin, fluorescein, etc. and thereby producing a characteristic colour at the end point.
  
• Chromatographic analysis: Chromatographic analysis based on the phenomenon of adsorption finds a number of applications in analytical and industrial fields.Thin layer chromotography is based on adsorption.
  
• Adsorption finds its application in Qualitative analysis also.