Easy Tutorial
For Competitive Exams

NEET - Chemistry Surface Chemistry Practice Q & A

22417.The Langmuir adsorption isotherm is deduced using the assumption
The adsorbed molecules interact with each other.
The adsorption takes place in multilayers.
The adsorption sites are equivalent in their ability to adsorb the particles.
The heat of adsorption varies with coverage.
22418.Which one of the following is an example for homogenous catalysis?
Hydrogenation of oil
Manufacture of ammonia by Haber's process
Manufacture of sulphuric acid by Contact process
Hydrolysis of sucrose in presence of dilute hydrochloric acid
22419.In Langmuir's model of adsorption of a gas on a solid surface
the adsorption at a single site on the surface may involve multiple molecules at the same time.
the mass of gas striking a given area of surface is proportional to the pressure of the gas.
the mass of gas striking a given area of surface is independent of the pressure of the gas.
the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered.
22420.2SO2(g) $\overset{V_2O_5}\rightleftharpoons$ is an example for
irreversible reaction
heterogenous catalysis
homogenous catalyst
neutralization reaction
22421.The addition of a catalyst during a chemical reaction alters which of the following quantities?
Enthalpy
Activation energy
Entropy
Internal energy
22422.Which one of the following does not involve coagulation?
Peptization
Formation of delta regions
Treatment of drinking water by potash alum
Clotting of blood by the use of ferric chloride
22423.For adsorption phenomenon,
ΔH = +ve, ΔS = –ve
ΔH = –ve, ΔS = +ve
ΔH = –ve, ΔS = –ve
ΔH = +ve, ΔS = +ve
22424.Which of the following statements is incorrect regarding physisorption?
It occurs because of van der Walls forces
More easily liquefiable gases are adsorbed readily
Under high pressure it results into multimolecular layer on adsorbent surface
Enthalpy of adsorption (ΔHadsorption) is low and positive
22425.At given temperature and pressure adsorption of which gas of the following will take place the most?
Dihydrogen
Dioxygen
Ammonia
Dinitrogen
22426.Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005 respectively. The correct order of their protective powers is
B < D < A < C
D < A < C < B
C < B < D < A
A < C < B < D
22427.The protecting power of lyophilic colloidal sol is expressed in terms of
Critical miscelle concentration
Oxidation number
Coagulation value
Gold number
22428.The basic principle of Cottrell's precipitator is
Le–Chatelier's principle
peptisation
neutralisation of charge on colloidal particles
scattering of light
22429.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
n
1/n
log K
–log K
22430.Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol.?
Na2S
(NH4)3PO4
K2SO4
NaCl
22431.Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is
CH3(CH2)15N+(CH3)3Br
CH3(CH2)11OSO
3
Na+
CH3(CH2)6COONa+
CH3(CH2)11N+(CH3)3Br
22432.Which of the following is correct for lyophilic sols?
They are irreversible
They are formed by inorganic substances
They are readily coagulated by addition of electrolytes
They are self stabilized
22433.During the adsorption of Krypton on activated charcoal at low temperature
ΔH < 0 and ΔS < 0
ΔH > 0 and ΔS < 0
ΔH > 0 and ΔS > 0
ΔH < 0 and ΔS > 0
22434.An emulsifier is a substance which ______.
coagulates the emulsion
homogenises the emulsion
stabilises the emulsion
accelerates the dispersion of liquid in liquid
22435.Identify the gas which is readily adsorbed by activated charcoal:
N2
O2
H2
SO2
22436.Which one of the following characteristics is associated with adsorption?
ΔG and ΔH are negative but ΔS is positive
ΔG and ΔS are negative but ΔH is positive
ΔG is negative but ΔH and ΔS are positive
ΔG, ΔH and ΔS all are negative
Share with Friends