Surface chemistry NCERT book Solutions

Q 5.1. Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Ans: This phenomenon of attracting and retaining the molecules of a substance by a solid or a liquid on its surface resulting into a higher concentration of the molecules on the surface is known as adsorption.

In absorption, the substance is uniformly distributed throughout the body of a solid or a liquid.

Water vapours are absorbed by anhydrous calcium chloride but adsorbed by silica gel.

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Colligative Properties Inforgraphics

Solid State Part 05

For more information regarding the structure of ionic crystals click on Solid-state Part 05

Solutions - Subjective questions on Solubility of solids in liquids

Subjective Questions 1. Why is benzene soluble in toluene but not in water? Sol. “ Like dissolves like”. Benzene and toluene are non-polar; H 2 O is polar. 2 . Explain, why solute-solute, solvent-solvent and solute-solvent interactions are important in determining the extent to which a solute dissolves in a solvent? Sol : In the dissolution process, solute – solute, solvent – solvent interactio n overcom e and solute – solvent interactions are overcome and solute – solvent i nteractions are established. The solubility of a solute thus, depends on the strength of new solute – solvent interactions relative to the strengths of solute – solute and solvent – solvent interactions. 3. Indicate the type of solute – solvent inter mole...

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