question_answer 1) At the critical micelle concentration (cmc) the surfactant molecules: [AIPMT 1998]
A)
decompose
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B)
dissociate
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C)
associate
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D)
become completely soluble
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question_answer 2) The method usually employed for the precipitation of a colloidal solution is: [AIPMT 2000]
A)
dialysis
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B)
addition of electrolytes
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C)
diffusion through animal membrane
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D)
condensation
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question_answer 3) Which of the following is correct? [AIPMT 2001]
A)
Cycloheptane is an aromatic compound
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B)
Diastase is an enzyme
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C)
Acetophenone is an ether
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D)
All of the above
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question_answer 4) Which is not correct regarding the adsorption of a gas on surface of solid? [AIPMT 2001]
A)
On increasing temperature adsorption increases continuously
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B)
Enthalpy and entropy change is -ve
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C)
Adsorption is more for some specific substance
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D)
Reversible
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question_answer 5) Position of non-polar and polar parts in Micelles: [AIPMT 2002]
A)
polar at outer surface but non-polar at inner surface
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B)
polar at inner surface non-polar at outer surface
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C)
distributed over all the surface
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D)
are present in the surface only
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question_answer 6) According to the adsorption theory of catalysis, the speed of the reaction increase because: [AIPMT 2003]
A)
absorption produces heat which increases the speed of the reaction
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B)
adsorption lowers the activation energy of the reaction
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C)
the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
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D)
in the process of adsorption, the activation energy of the molecules becomes large
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question_answer 7) The radioactive isotope\[_{27}^{60}Co\] which is used in the treatment of cancer can be made by (n, p)reaction. For this reaction the target nucleus is: [AIPMT (S) 2004]
A)
\[_{28}^{59}\text{Ni}\]
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B)
\[_{27}^{59}\text{Co}\]
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C)
\[_{28}^{60}\text{Ni}\]
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D)
\[_{27}^{60}\text{Co}\]
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question_answer 8) Which of the following forms cationic micelles above certain concentration? [AIPMT (S) 2004]
A)
Sodium ethyl sulphate
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B)
Sodium acetate
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C)
Urea
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D)
Cetyltrimethylammonium bromide
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question_answer 9) A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three \[\alpha \]-particles in succession. The group of the periodic table to which the resulting daughter element would belong is: [AIPMT (S) 2005]
A)
Group 14
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B)
Group 16
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C)
Group 4
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D)
Group 6
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question_answer 10) Which one of the following forms micelles in aqueous solution above certain concentration? [AIPMT (S) 2005]
A)
Urea
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B)
Dodecyl trimethyl ammonium chloride
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C)
Pyridinium chloride
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D)
Glucose
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question_answer 11) A plot of \[\log \,m/x\] versus \[\log \,\,p\] for the adsorption of a gas on a solid gives a straight line with slope equal to: [AIPMT (S) 2006]
A)
- log k
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B)
n
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C)
\[\frac{1}{n}\]
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D)
log k
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question_answer 12) The Langmuir adsorption isotherm is deduced using the assumption: [AIPMT (S) 2007]
A)
The adsorption takes place in multilayers
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B)
The adsorption sites are equivalent in their ability to adsorb the particles
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C)
The heat of adsorption varies with coverage
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D)
The adsorbed molecules interact with each other
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question_answer 13) If x is amount of adsorb ate and m is amount of adsorbent, which of the following relations is not related to adsorption process? [AIPMT (S) 2011]
A)
\[\frac{x}{m}=f(T)\] at constant?
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B)
\[p=f(T)\] at constant \[\left( \frac{x}{m} \right)\]
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C)
\[\frac{x}{m}=p\times T\]
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D)
\[\frac{x}{m}=f\](p) at constant T
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question_answer 14) In Freundlich adsorption isotherm, the value of 1/n is [AIPMT (S) 2012]
A)
between 0 and 1 in all cases
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B)
between 2 and 4 in all cases
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C)
1 in case of physical adsorption
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D)
1 in case of chemisorption
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question_answer 15) The protecting power of lyophilic colloidal sol is expressed in terms of [AIPMT (S) 2012]
A)
coagulation value
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B)
gold number
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C)
critical micelle concentration
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D)
oxidation number
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question_answer 16) Which property of colloids is not dependent on the charge on colloidal particles? [AIPMT 2014]
A)
Coagulation
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B)
Electrophoresis
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C)
Electro-osmosis
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D)
TyndalI effect
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question_answer 17) Which property of colloidal solution is independent of charge on the colloidal particles? [NEET 2015]
A)
Coagulation
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B)
Electrophoresis
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C)
Electroosmosis
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D)
Tyndall effect
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question_answer 18) Which one of the following characteristics is associated with adsorption? [NEET - 2016]
A)
\[\Delta G\]is negative but \[\Delta H\]and \[\Delta S\]are positive
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B)
\[\Delta G,\Delta H\]and \[\Delta S\]all are negative
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C)
\[\Delta G\]and\[\Delta H\]are negative but\[\Delta S\] is positive
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D)
\[\Delta G\]and \[\Delta S\] are negative but \[\Delta H\]is positive
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question_answer 19) The addition of a catalyst during a chemical reaction alters which of the following quantities? [NEET - 2016]
A)
Entropy
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B)
Internal energy
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C)
Enthalpy
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D)
Activation energy
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question_answer 20) Fog is colloidal solution of:- [NEET - 2016]
A)
Liquid in gas
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B)
Gas in liquid
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C)
Solid in gas
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D)
Gas in gas
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question_answer 21) Which one of the following statements is not correct? [NEET-2017]
A)
Coenzymes increase the catalytic activity of enzyme
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B)
Catalyst does not initiate any reaction
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C)
The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
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D)
Enzymes catalyse mainly bio-chemical reactions
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question_answer 22) On which of the following properties does the coagulating power of an ion depend? [NEET - 2018]
A)
Both magnitude and sign of the charge on the ion
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B)
Size of the ion alone
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C)
The magnitude of the charge on the ion alone
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D)
The sign of charge on the ion alone
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question_answer 23) Which mixture of the solution will lead to the formation of negatively charged colloidal \[[AgI]{{I}^{}}\] [NEET 2019]
A)
\[50mL\text{ }of\text{ }2M\text{ }AgN{{O}_{3}}+50mL\text{ }of\text{ }1.5M\text{ }KI\]
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B)
\[50mL\text{ }of\text{ }0.1M\text{ }AgN{{O}_{3}}+50mL\text{ }of\text{ }0.1M\text{ }KI\]
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C)
\[50mL\text{ }of\text{ }1M\text{ }AgN{{O}_{3}}+50mL\text{ }of\text{ }1.5M\text{ }KI\]
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D)
\[50mL\text{ }of\text{ }M\text{ }AgN{{O}_{3}}+50mL\text{ }of\text{ }2M\text{ }KI\]
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question_answer 24) Measuring Zeta potential is useful in determining which property of colloidal solution? [NEET 2020]
A)
Solubility
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B)
Stability of the colloidal particles
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C)
Size of the colloidal particles
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D)
Viscosity
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