Surface Chemistry

Fog is a colloidal solution of 

• Gas in liquid

• Solid in gas

• Gas in gas

• Gas in gas

Which property of colloidal solution is independent of charge on the colloidal particles?

• Coagulation

• Electrophoresis

• Electroosmosis

• Tyndall effect

Which property of colloids is not dependent on the charge on colloidal particles?

• Coagulation

• Electrophoresis

• Electro-osmosis

• Electro-osmosis

The ease of adsorption of the hydrated alkali metal ions on an ion exchange resins follows the order

• Li⁺ > K⁺ >Na⁺> Rb⁺
  

• Rb⁺ < K⁺ < Na⁺ < Li⁺

• K⁺ >Na⁺>  Rb⁺ > Li⁺

• K⁺ >Na⁺>  Rb⁺ > Li⁺

The protecting power of lyophilic colloidal sol is expressed in terms of 

• Coagulation value

• Gold number

• Critical micelle concentration

• Critical micelle concentration

The Langmuir adsorption isotherm is deduced using  the assumption: 

• the adsorption takes place in multilayers

• The adsorption sites are equivalent in their ability to adsorb the particles

• The adsorbed molecules interact with each other

• The adsorbed molecules interact with each other

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:

• -log k

• n

• 1/n

• 1/n

On which of the following properties does the coagulating power of an ion depend?

• The magnitude of the charge on the ion alone

• Size of the ion alone

• The sign of the charge on the ion alone

• Both magnitude and sign of the charge on the ion

Given van der Waals constant for NH₃, H₂, O₂ and CO₂ are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?

• NH₃

• H₂

• CO₂

• O₂

Which of the following is not applicable to the phenomenon of adsorption?

• ΔH> 0

• ΔG<0

• ΔS<0

• ΔH<0