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Surface Chemistry

27 Questions
All Exams NEET AIIMS
2023 NEET MCQ
NEET 2023 Manipur

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
2023 NEET MCQ
NEET 2023

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.
2023 NEET MCQ
NEET 2023

Pumice stone is an example of -

A.
gel
B.
solid sol
C.
foam
D.
sol
2022 NEET MCQ
NEET 2022 Phase 2

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

NEET 2022 Phase 2 Chemistry - Surface Chemistry Question 4 English

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.
${T_1} = {T_2} = {T_3}$
2022 NEET MCQ
NEET 2022 Phase 1

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.
2021 NEET MCQ
NEET 2021
The right option for the statement "Tyndall effect is exhibited by", is :
A.
Urea solution
B.
NaCl solution
C.
Glucose solution
D.
Starch solution
2020 NEET MCQ
NEET 2020 Phase 1
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
2018 NEET MCQ
NEET 2018
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
2017 NEET MCQ
NEET 2017
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.
2016 NEET MCQ
NEET 2016 Phase 2
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
2016 NEET MCQ
NEET 2016 Phase 1
Fog is a colloidal solution of
A.
solid in gas
B.
gas in gas
C.
liquid in gas
D.
gas in liquid.
2016 NEET MCQ
NEET 2016 Phase 1
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.
2015 NEET MCQ
AIPMT 2015 Cancelled Paper
Which property of colloidal solution is independent of charge on the colloidal particles?
A.
Electro-osmosis
B.
Tyndall effect
C.
Coagulation
D.
Electrophoresis
2014 NEET MCQ
AIPMT 2014
Which property of colloids is not dependent on the charge on colloidal particles?
A.
Coagulation
B.
Electrophoresis
C.
Electro-osmosis
D.
Tyndall effect
2012 NEET MCQ
AIPMT 2012 Prelims
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
2012 NEET MCQ
AIPMT 2012 Prelims
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.
2012 NEET MCQ
AIPMT 2012 Prelims
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.
2011 NEET MCQ
AIPMT 2011 Prelims
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.
${x \over m} = p \times T$
2007 NEET MCQ
AIPMT 2007
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.
2006 NEET MCQ
AIPMT 2006
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
2005 NEET MCQ
AIPMT 2005
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
2004 NEET MCQ
AIPMT 2004
The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called
A.
maltase
B.
lipase
C.
zymase
D.
pepsin
2003 NEET MCQ
AIPMT 2003
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.
2002 NEET MCQ
AIPMT 2002
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.
2001 NEET MCQ
AIPMT 2001
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.
2000 NEET MCQ
AIPMT 2000
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
2019 NEET MSQ
NEET 2019
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