ChemistryQ351–358 of 627 questions
Page 8 of 8 · English
351
ChemistryMediumMCQMHT CET · 2022
Which is $NOT$ an example of a macromolecular colloid?
A
Protein
B
Polythene
C
Nylon
D
Soap
Solution
(D) In macromolecular colloids,the molecules of the dispersed phase are sufficiently large in size (macro) to be of colloidal dimensions.
Examples of macromolecular colloids include starch,cellulose,proteins,polythene,nylon,and plastics.
Soap is an example of an associated colloid (micelle),not a macromolecular colloid.
Examples of macromolecular colloids include starch,cellulose,proteins,polythene,nylon,and plastics.
Soap is an example of an associated colloid (micelle),not a macromolecular colloid.
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352
ChemistryEasyMCQMHT CET · 2022
Which of the following is an example of multimolecular colloids?
A
Starch
B
$S_8$ molecule
C
Plastic
D
Cellulose
Solution
(B) Multimolecular colloids are formed by the aggregation of a large number of atoms or smaller molecules with diameters less than $1 \ nm$.
$S_8$ (sulfur) molecules aggregate to form particles of colloidal size,making it a classic example of a multimolecular colloid.
Starch,cellulose,and plastic are examples of macromolecular colloids.
$S_8$ (sulfur) molecules aggregate to form particles of colloidal size,making it a classic example of a multimolecular colloid.
Starch,cellulose,and plastic are examples of macromolecular colloids.
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353
ChemistryMediumMCQMHT CET · 2022
Identify the colloidal molecule containing a hydrophilic head and a hydrophobic tail.
A
Detergent
B
Cellulose
C
Starch
D
Gold sol
Solution
(A) Soap and detergents are examples of associative colloids (micelles).
They consist of a long hydrocarbon chain which is hydrophobic (water-repelling) and a polar ionic group (like $-COO^-$ or $-SO_3^-$) which is hydrophilic (water-attracting).
Therefore,the correct answer is $A$.
They consist of a long hydrocarbon chain which is hydrophobic (water-repelling) and a polar ionic group (like $-COO^-$ or $-SO_3^-$) which is hydrophilic (water-attracting).
Therefore,the correct answer is $A$.
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354
ChemistryEasyMCQMHT CET · 2022
What type of solution is sea water?
A
liquid in solid
B
solid in solid
C
solid in liquid
D
liquid in liquid
Solution
(C) Sea water is a solution where salt (a solid solute) is dissolved in water (a liquid solvent). Therefore,it is classified as a $solid \text{ in } liquid$ type of solution.
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355
ChemistryMediumMCQMHT CET · 2022
What is the range of particle size in the colloidal state?
A
$1-1000 \ nm$
B
Greater than $1000 \ nm$
C
$100-1000 \ nm$
D
Less than $1 \ nm$
Solution
(A) The size of colloidal particles typically ranges from $1 \ nm$ to $1000 \ nm$ ($10^{-9} \ m$ to $10^{-6} \ m$).
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356
ChemistryMediumMCQMHT CET · 2022
Which among the following is a negatively charged sol?
A
$CdS$
B
$CrO_3 \cdot xH_2O$
C
$Al_2O_3 \cdot xH_2O$
D
$TiO_2$
Solution
(A) Colloidal sols are classified based on the charge on the dispersed phase particles.
$CdS$ (Cadmium sulfide) is a well-known example of a negatively charged sol.
In contrast,metal oxides and hydrated metal oxides like $Al_2O_3 \cdot xH_2O$,$CrO_3 \cdot xH_2O$,and $TiO_2$ are typically positively charged sols.
$CdS$ (Cadmium sulfide) is a well-known example of a negatively charged sol.
In contrast,metal oxides and hydrated metal oxides like $Al_2O_3 \cdot xH_2O$,$CrO_3 \cdot xH_2O$,and $TiO_2$ are typically positively charged sols.
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357
ChemistryEasyMCQMHT CET · 2022
Identify the correct statement for an "oil in water" $(O/W)$ type of emulsion.
A
Basic metal sulfates are used as emulsifiers.
B
Oil is the dispersion medium.
C
Water is the dispersed phase.
D
There is no effect on conducting power when a small amount of an electrolyte is added.
Solution
(A) In an "oil in water" $(O/W)$ emulsion,water acts as the dispersion medium and oil acts as the dispersed phase.
Since water is the dispersion medium,the emulsion can conduct electricity.
When a small amount of an electrolyte is added to an $O/W$ emulsion,the conducting power increases significantly because the dispersion medium (water) is a polar solvent capable of dissolving electrolytes to form ions.
Therefore,the correct statement is that basic metal sulfates (or proteins/soaps) are often used as emulsifiers to stabilize $O/W$ emulsions.
Since water is the dispersion medium,the emulsion can conduct electricity.
When a small amount of an electrolyte is added to an $O/W$ emulsion,the conducting power increases significantly because the dispersion medium (water) is a polar solvent capable of dissolving electrolytes to form ions.
Therefore,the correct statement is that basic metal sulfates (or proteins/soaps) are often used as emulsifiers to stabilize $O/W$ emulsions.
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358
ChemistryEasyMCQMHT CET · 2022
Which among the following is a zero-dimensional nanostructure?
A
Nanorods
B
Nanowires
C
Nanoparticles
D
Thin films
Solution
(C) Nanostructures are classified based on their dimensions. $0-D$ nanostructures have all three dimensions in the nanometer range,such as $Nanoparticles$. $1-D$ nanostructures have two dimensions in the nanometer range,such as $Nanorods$ and $Nanowires$. $2-D$ nanostructures have one dimension in the nanometer range,such as $Thin \text{ } films$.
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