Question 1: Palette 1/27

NEET 2023 MCQ

Which of the following is a positively charged sol?

A

Methylene blue sol

B

Congo red sol

C

Silver sol

D

Sb$_2$S$_3$ sol

Question 2: Palette 2/27

NEET 2023 MCQ

Which one is an example of heterogenous catalysis?

A

Hydrolysis of sugar catalysed by $\mathrm{H}^{+}$ ions.

B

Decomposition of ozone is presence of nitrogen monoxide.

C

Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.

D

Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.

Question 3: Palette 3/27

NEET 2023 MCQ

Pumice stone is an example of -

A

gel

B

solid sol

C

foam

D

sol

Question 4: Palette 4/27

NEET 2022 MCQ

Shown below are adsorption isotherms for a gas 'X' at temperatures T₁, T₂ and T₃ :

p and ${x \over m}$ represent pressure and extent of adsorption, respectively. The correct order of temperatures for the given adsorption is :

A

${T_1} = {T_2} > {T_3}$

B

${T_1} > {T_2} > {T_3}$

C

${T_3} > {T_2} > {T_1}$

D

${T_1} = {T_2} = {T_3}$

Question 5: Palette 5/27

NEET 2022 MCQ

Given below ae two statements

Statement I:

In the coagulation of a negative sol, the flocculating power of the three given ions is in the order Al³⁺ > Ba²⁺ > Na⁺

Statement II:

In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl > Na₂SO₄ > Na₃PO₄

In the light of the above statements, choose the most appropriate answer from the options given below

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 6: Palette 6/27

NEET 2021 MCQ

The right option for the statement "Tyndall effect is exhibited by", is :

A

Urea solution

B

NaCl solution

C

Glucose solution

D

Starch solution

Question 7: Palette 7/27

NEET 2020 MCQ

Measuring Zeta potential is useful in determining which property of colloidal solution?

A

Solubility

B

Stability of the colloidal particles

C

Size of the colloidal particles

D

Viscosity

Question 8: Palette 8/27

NEET 2019 MSQ

Which mixture of the solution will lead to the formation of negatively charged colloidal [AgI] I^– sol. ?

A

50 mL of 2 M AgNO₃ + 50 mL of 1.5 M KI

B

50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI

C

50 mL of 1 M AgNO₃ + 50 mL of 1.5 M KI

D

50 mL of 1 M AgNO₃ + 50 mL of 2 M KI

Question 9: Palette 9/27

NEET 2018 MCQ

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

A

The magnitude of the charge on the ion alone

B

Size of the ion alone

C

Both magnitude and sign of the charge on the ion

D

The sign of charge on the ion alone

Question 10: Palette 10/27

NEET 2017 MCQ

Which one of the following statements is not correct?

A

The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.

B

Enzymes catalyse mainly bio-chemical reactions.

C

Coenzymes increase the catalytic activity of enzyme.

D

Catalyst does not initiate any reaction.

Question 11: Palette 11/27

NEET 2016 MCQ

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below :
I.  (NaCl) = 52,
II. (BaCl₂) = 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 12: Palette 12/27

NEET 2016 MCQ

Fog is a colloidal solution of

A

solid in gas

B

gas in gas

C

liquid in gas

D

gas in liquid.

Question 13: Palette 13/27

NEET 2016 MCQ

Which one of the following characteristics is associated with adsorption?

A

$\Delta $G and $\Delta $H are negative but $\Delta $S is positive.

B

$\Delta $G and $\Delta $S are negative but $\Delta $H is positive.

C

$\Delta $G is negative but $\Delta $H and $\Delta $S are positive.

D

$\Delta $G, $\Delta $H and $\Delta $S all are negative.

Question 14: Palette 14/27

NEET 2015 MCQ

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

A

Electro-osmosis

B

Tyndall effect

C

Coagulation

D

Electrophoresis

Question 15: Palette 15/27

NEET 2014 MCQ

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

A

Coagulation

B

Electrophoresis

C

Electro-osmosis

D

Tyndall effect

Question 16: Palette 16/27

NEET 2012 MCQ

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

A

coagulation value

B

gold number

C

critical micelle concentration

D

oxidation number

Question 17: Palette 17/27

NEET 2012 MCQ

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 denatured by ultraviolet rays and at high temperature.

D

enzymes are least reactive at optimum temperature.

Question 18: Palette 18/27

NEET 2012 MCQ

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 case of physical absorption

D

1 in case of chemisorption.

Question 19: Palette 19/27

NEET 2011 MCQ

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

A

x/m = $f$(p) at constant T

B

x/m = f(T) at constant p

C

p = f(T) at constant (x/m)

D

${x \over m} = p \times T$

Question 20: Palette 20/27

NEET 2007 MCQ

The Langmuir adsorption isotherm is deduced using the assumption

A

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

B

the heat of adsorption varies with coverage

C

the adsorbed molecules interact with each other

D

the adsorption takes place in multilayers.

Question 21: Palette 21/27

NEET 2006 MCQ

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

A

log K

B

$-$ log K

C

n

D

1/n

Question 22: Palette 22/27

NEET 2005 MCQ

Which one of the following forms micelles in aqueous solution above certain concentration?

A

Dodecyl trimethyl ammonium chloride

B

Glucose

C

Urea

D

Pyridinium chloride

Question 23: Palette 23/27

NEET 2004 MCQ

The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called

A

maltase

B

lipase

C

zymase

D

pepsin

Question 24: Palette 24/27

NEET 2003 MCQ

According to the adsorption theory of catalysis, the speed of the reaction increases because

A

the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption

B

in the process of adsorption , the activation energy of the molecules becomes large

C

adsorption produces heat which increases the speed of the reaction

D

adsorption lowers the activation energy of the reaction.

Question 25: Palette 25/27

NEET 2002 MCQ

Position of non polar and polar part in micelle

A

polar at outer surface but non polar at inner surface

B

polar at inner surface non polar at outer surface

C

distributed over all the surface

D

are present in the surface only.

Question 26: Palette 26/27

NEET 2001 MCQ

Which is not correct regarding the adsorption of a gas on surface of a solid?

A

On increasing temperature adsorption increases continuously.

B

Enthalpy and entropy change is negative.

C

Adsorption is more for some specific substance.

D

It is a reversible reaction.

Question 27: Palette 27/27

NEET 2000 MCQ

Which one of the following method is commonly used method for destruction of colloid?

A

Dialysis

B

Condensation

C

Filteration by animal membrane

D

By adding electrolyte