Surface Chemistry

What kind of process is adsorption?

Entropy during adsorption ...........

• Decreases

• Increases

• Remain Same

• Cannot say

Peptisation is a process of

• Precipitation of colloid

• Dispersion of precipitate

• purification of colloids

• Movement of colloid under electric potential

The difference in potential of fixed and mobile layer is called ..........

Extent of physisorption increases with

• decrease in surface area

• increase in temperature

• decrease in temperature

• decrease in strength of van der waal forces

In physisorption adsorbent does not show specificity for any particular gas because ______________.

• involved van der Waals forces are universal

• it is a reversible process

• Enthalpy is low

• Gases behave as ideal gases

At high concentration of soap in water, soap behaves as

• multimolecular colloid

• macromolecular colloid

• associated colloid

• Solution

The minimum temperature required for formation of associated colloid is called...........

• Critical temperature

• Inversion temperature

• Kraft temperature

• Boyle's temperature

Which of the following electrolytes will have maximum coagulating value for AgI/Ag⁺ sol? (AgI/Ag+ implies positive sol)

• $Na_2S$
  

• NaCl

• $Na_3PO_4$

• $Na_2SO_4$

Which of the following ion will have highest coagulating power for coagulating a negatively charged sol?

• $NaCl$

• $CaCl_2$

• $AlCl_3$

• $KCl$