### NEET Chemistry - New - Surface Chemistry

#### Question - 1

Which one of the following statements is not correct?

• A Catalyst does not initiate any reaction
• B The value of equilibrium constant is changed in the presence of a catalyst in the reaction equilibrium
• C Enzymes catalyze mainly biochemical reaction
• D Coenzymes increase the catalytic activity of enzyme

#### Question - 2

Which one of the following characteristics is associated with adsorption?

• A ∆G and ∆H are negative but ∆S is positive.
• B ∆G and ∆S are negative but ∆H is positive
• C ∆G is negative but ∆H and ∆S are positive
• D ∆G, ∆H and ∆S all are negative

#### Question - 3

Which of the following statement is correct for the spontaneous adsorption of a gas?

• A ∆S is negative and therefore, ∆H should be highly positive.
• B ∆S is negative and therefore, ∆H should be highly negative.
• C ∆S is positive and therefore, ∆H should be negative.
• D ∆S is positive and therefore, ∆H should be highly positive.

#### Question - 4

In Freundlich adsorption isotherm, the value of 1/n is:

• A between 0 and 1 in all cases
• B between 2 and 4 in all cases
• C 1 in cases of physical adsorption
• D 1 in case of chemisorption

#### Question - 5

Which one of. the following statements is incorrect about enzyme catalysis?

• A Enzymes are mostly proteinous in nature
• B Enzyme action is specific
• C Enzymes are denaturated by UV - rays and at high temperature
• D Enzymes are least reactive at optimum temperature

#### Question - 6

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

• A $\frac { x }{ m }$ = f (T) at constant p
• B p = f (T) at constant $\left( \frac { x }{ m } \right)$
• C $\frac { x }{ m }$ = p x T
• D $\frac { x }{ m }$ = f (p) at constant T

#### Question - 7

The Langmuir adsorption isotherm is deduced by using the assumption that:

• A the adsorption takes place in multi-layers
• B the adsorption sites are equivalent in their ability to adsorb the particles.
• C the heat of adsorption varies with coverage
• D the adsorbed molecules interact with each other

#### Question - 8

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

• A Both magnitude and sign of the charge on the ion
• B Size of the ion alone
• C The magnitude of the charge on the ion alone
• D The sign of charge on the ion alone

#### Question - 9

The coagulation value in millimoles per liter of the electrolytes used for the coagulation of As2S3 are given below:
I. (NaCI) = 52
II. (BaCI2) = 0.69
III. (MgSO4) = 0.22
The correct order of their coagulating power is

• A I > II > III
• B II > I > III
• C III > II > I
• D III > I > II

#### Question - 10

Fog is a colloidal solution of:

• A Solid in gas
• B gas in gas
• C liquid in gas
• D gas in liquid