Surface Chemistry - Assessment

1.

Fill in the Blank

2 mins

1 pt

What kind of process is adsorption?

2.

Multiple Select

2 mins

1 pt

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

Decreases

Increases

Remain Same

Cannot say

3.

Multiple Choice

2 mins

1 pt

Peptisation is a process of

Precipitation of colloid

Dispersion of precipitate

purification of colloids

Movement of colloid under electric potential

4.

Fill in the Blank

2 mins

1 pt

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

5.

Multiple Choice

2 mins

1 pt

Extent of physisorption increases with

decrease in surface area

increase in temperature

decrease in temperature

decrease in strength of van der waal forces

6.

Multiple Choice

2 mins

1 pt

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

7.

Multiple Choice

2 mins

1 pt

At high concentration of soap in water, soap behaves as

multimolecular colloid

macromolecular colloid

associated colloid

Solution

8.

Multiple Choice

2 mins

1 pt

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

Critical temperature

Inversion temperature

Kraft temperature

Boyle's temperature

9.

Multiple Choice

2 mins

1 pt

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

$Na_2S$

NaCl

$Na_3PO_4$

$Na_2SO_4$

10.

Multiple Choice

2 mins

1 pt

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

$NaCl$

$CaCl_2$

$AlCl_3$

$KCl$

11.

Multiple Choice

2 mins

1 pt

If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as

Emulsion

Solid Sol

Gel

Sol

12.

Multiple Choice

2 mins

1 pt

The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as

Tyndall Effect

Brownian Motion

Electrophoresis

Coagulation

13.

Multiple Choice

2 mins

1 pt

The process of settling of colloidal particle is called....

Peptization

Caogulation

Dialysis

Emulsification

14.

Multiple Choice

2 mins

1 pt

It is a process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane

Electrophoresis

Dialysis

Precipitation

Peptization

15.

Multiple Choice

2 mins

1 pt

Which is not true for chemisorption?

It involves high activation energy

It is highly specific

It involves chemical bond formation

It is reversible

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