Which statements are correct for chemical adsorption?
50%
a) Reactant molecules are adsorbed on surface by can der Waal's force
33%
b) It is irreversible with temperature suslly occurring at high temerature
17%
c) Strong multilayer, directional and non-specific
0%
d) It requires no activation energy
Q.3.
The stability of the dispersed phase in a lyophobic collid is due to
0%
a) high viscosity of the medium
50%
b) the formation of electrical layer between two phases
12%
c) high surface tension of soolution
38%
d) None of the sawer is correct
Q.4.
The curve showing the variation of adsorption with pressure at constant temperaure is called..
0%
a) an isoster
86%
b) adsorption isotherm
14%
c) adsorption isobar
0%
d) all of these
Q.5.
Which one of the following forms micelles in aqueous solution above certain concentration? AIMPT 2005]
0%
a) Urea
71%
b) Dodecyl trimethyl ammonium chloride
14%
c) Pyridinium chloride
14%
d) Glucose
Q.6.
Butter is a colloid form in which
14%
a) fat is dispered in water
14%
b) globules of casen dispersed in fat
14%
c) suspension of fat in water
57%
d) water is disperesed in fat
Q.7.
Assertion: Enzymes are proteins and enzyme catalyzed reaction are called biological catalysis Reason: The activity of enzyme as catalyst is increased in presence of vitamins
17%
a) Assertion and reason both are correct and Reason is correct explanation of Assertion
67%
b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
0%
c) Assertion is correct but Reasoning is wrong
17%
d) Assertion is wrong but reason is correct
Q.8.
Lyophobic colloids are ...
33%
a) reversible colloids
50%
b) irreversible colloids
0%
c) gum, proteins
17%
d) protective colloids
Q.9.
The ability of ion to bring about coagulation of a given colloidal solution depends upon
17%
a) the size of its ion
0%
b) the magnitude of charge
33%
c) the sign of charge
50%
d) both magnitude and sign of charge
Q.10.
Hydrolysis of protein in stomach and in intestine takes place due to action of enzyme
0%
a) pepsine in stomach only
17%
b) trypsin in intestine only
83%
c) pepsin in stomach and trypsin in intestine
0%
d) HCl in stomach
Q.11.
Which is universally correct for catalyst?
0%
a) A catalyat chemically changes at the end of reaction
0%
b) All kind of catalysts undergoes catalytic poisoning
50%
c) A catalyst remains unchanged chemically at the end of chemical reaction
50%
d) Catalyst accelerates the reaction
Q.12.
Assertion: Presence of catalyst alter the individual energy of reactants and products Reason: The numerical value of Δ H or Δ U for the given reaction does not change in presence of catalyst
17%
a) Assertion and reason both are correct and Reason is correct explanation of Assertion
50%
b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
33%
c) Assertion is correct but Reasoning is wrong
0%
d) Assertion is wrong but reason is correct
Q.13.
When dilute aqueous solution of AgNO3 (excess) added to KI solution, positively charged sol particles of AgI are formed due to adsorption of ion
0%
a) K+
33%
b) Ag+
17%
c) I-
50%
d) NO3-
Q.14.
Assertion: Term catalyst means specifically for a substance that accelerates the reaction Reason: The terms inhibitor is commonly used for substances which retards the rate of reaction
20%
a) Assertion and reason both are correct and Reason is correct explanation of Assertion
80%
b) Assertion and reason both are correct and Reason is not correct explanation of Assertion
0%
c) Assertion is correct but Reasoning is wrong
0%
d) Assertion is wrong but reason is correct
Q.15.
A dilute solution of litmus becomes colourless on shaking with charcoal. This is due to ..
0%
a) absorption
50%
b) adsorption
0%
c) chemical reaction
50%
d) both (a) and (b)
Q.16.
etergent action of synthetic detergents is due to their ...
0%
a) ionisation
40%
b) emulsifying properties
20%
c) interfacial area
40%
d) high molar mass
Q.17.
An arsenious sulphide solution carries a negative charge. The maximum precipitating power of this sol is possessed by ..
20%
a) K2SO4
20%
b) CaCl2
20%
c) Na3PO4
40%
d) AlCl3
Q.18.
Which is correct in case of van der Waals' adsorption?
0%
a) Low temerature, low pressure
40%
b) High temerature and high pressure
20%
c) Low temerature, high pressure
40%
d) High temerature and low pressure
Q.19.
Size of colloidal particles is
20%
a) < suspension particles
60%
b) > true solution particles
20%
c) < true solution particles
0%
d) = suspension particles
Q.20.
Which of the following forms cationic micelles above certain concentration? [AIPMT 2004]
40%
a) Sodium ethyl sulphate
0%
b) Sodium acetate
0%
c) Urea
60%
d) Cetyl trimethyl ammonium bromide
Q.21.
Inhibitor is one ..
0%
a) takes reaction in backward direction
0%
b) takes reaction in forward direction
0%
c) promotes by products
100%
d) decreases the rate of reaction
Q.22.
Pick out wrong statement
20%
a) Cleansing action is not related to micelles
60%
b) Micelles are formed by surfactant molecules above the Critical Micelle Concentration (CMC)
20%
c) The conductivity of a solution having surfactant molecules decreases sharply at the CMC
0%
d) Lower is the CMC of detergent, more is its detergency
Q.23.
In Langmuir’s model of adsorption of gas on solid surface [ AIEEE 2006]
20%
a) The mass of gas striking a given area of surface is independent of the pressure of the gas
40%
b) The adsorption at a single site on the surface may involved multiple molecules at the same time.
20%
c) The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
20%
d) The mass of gas striking a given area of surface is proportional to the pressure of the gas
Q.24.
Protons accelerate the hydrolsis of esters. This is an example of
40%
a) hetrogeneous catalysis
0%
b) homogeneous catalysis
40%
c) acid base catalysis
20%
d) Both b and c
Q.25.
Silver iodide is used for producing artificiial rains because silver iodide
20%
a) is easy to spray at high altitde
0%
b) is nsoluble in water
40%
c) has crystal structure similar to ice
40%
d) is easy to synthesize
Q.26.
which is not a property of hydrophilic sols
0%
a) High concnetrations of dispersed phase can be easily attained
20%
b) Coagulation is reversible
60%
c) The affinity between disperse phase and dispersion medium is weak.
20%
d) The viscosity of colloid is higher than that of the dispersion medium
Q.27.
In colloidal state, particle size ranges from
0%
a) 1 to 10 Å
20%
b) 20 to 50 Å
60%
c) 10 to 1000 Å
20%
d) 1 to 280 Å
Q.28.
Enzyme catalysts are ...
75%
a) highly specific in nature
0%
b) non-specific
25%
c) solids
0%
d) always liquid
Q.29.
Which of the following is not a characteristic of chemisorption?
17%
a) Adsorption is irreversible
67%
b) ΔH is of the order of 900 kJ
0%
c) Adsorption is specific
17%
d) Adsorption increases with increase of surface area
Q.30.
In Freundlich adsorption isotherm, the value of 1/n is [ AIMPT 2012]
40%
a) between 0 and 1 in all cases
0%
b) between 2 and 4 in all cases
20%
c) 1 in case of physical adsorption
40%
d) 1 in case of chemisorption
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