Surface Chemistry

Which of the following does NOT occur at the interface of phases?

• crystallisation

• heterogenous catalysts

• homogenous catalysts

• corrosion

Which of the following substances will precipitate the negatively charged emulsions?

• KCl

• glucose

• urea

• None of the above

What happens when gelatin is mixed with gold sol?

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In a reaction, catalyst changes

• physically

• qualitatively

• chemically

• quantitatively

Which of the following phenomenon occurs when a chalk stick is dipped in ink?

• adsorption of coloured substance

• adsorption of solvent

• absorption and adsorption both of solvent

• absorption of solvent

In Freundlich adsorption isotherm, at saturation pressure, the rate of adsorption becomes equal to the rate of -------------.

• absorption

• sorption

• desorption

• activation

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

• Decreases

• Increases

• Remain Same

• Cannot say

Which is not true for chemisorption?

• It involves high activation energy

• It is highly specific

• It involves chemical bond formation

• It is reversible