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Published on: 28/08/2019
Surface Chemistry
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Questions + Answers key
Take MCQ Chemistry Test
1.
If we add equimolar amount of \(Fe{ \left( OH \right) }_{ 3 }\) to \({ As }_{ 2 }{ S }_{ 3 }\) sol, what will happen?
2.
A sol is prepared by addition of excess of \({ AgNO }_{ 3 }\) solution in KI solution. What charge is likely to develope on the colloidal particles?
3.
What is meant by 'shape-selective catalysis' of reactions?
4.
What will be the charge on AgI colloidal particles when it is prepared by addition of small amount of \(AgNO_{ 3 }\) to KI slution in water. What is responsible for development of this charge?
5.
How does a delta formed at the meeting place of sea and river water?
6.
Which of the following electrolytes will be most effective in the coagulation of gold sol?
NaNO3
K4 [Fe(CN)6]
Na3PO4
MgCl2
7.
Purple of cassius is a cooloidal sol of
silver
platinum
gold
iron
8.
Which of the following is correct about lyophilic sols?
They are irreversible
They are formed by inorhanic substances.
They are readily coagulated by addition of electrolytes.
They are self-stabilized.
9.
Which of the following statements is uncorrect regarding physiosorption?
It occurs because of van der Eaals forces
More easily liquefiable gases are adsorbed readily
Under high pressure, it results into multimolecular layer on adsorbent surface
Enthalpy of adsorption \(\left( \triangle { H }_{ adsorption } \right) \) is low and positive
10.
Which of the following is true in respect of adsorption?
\(\triangle G<0,\triangle S>0,\triangle H<0\)
\(\triangle G<0,\triangle S<0,\triangle H<0\)
\(\triangle G>0,\triangle S>0,\triangle H<0\)
\(\triangle G<0,\triangle S<0,\triangle H>0\)
11.
Adsorption of N2 gas on iron at 83 K is........where as at 773 K, it is.....................(fill in the type of adsorption).
12.
The heat od adsorption in physisorption lies in the range.............kJ mol-1.
13.
The nature of forces involved in physical adsorption are................... .
14.
Increasing the adsorbing power of an adsorbent by subdividing it is called...............of the solid adsorbent.
15.
Adsorption of a gas on the surface of a solid adsorbent is......................(exothermic or endothermic or neither exothermic nor endothermic).
16.
Solvent molecules pass through semipermeable menbers towards solution side
17.
Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes
18.
Solved molecules pass through semipermeable member towards solvent side
19.
Dispersion medium moves in an electric field
20.
Soap mixed with water below critical micelle concentration
1.
( )
Mutual coagulation will take place because \(Fe{ \left( OH \right) }_{ 3 }\) is positively charged colloid, whereas \({ As }_{ 2 }{ S }_{ 3 }\) is negatively charged colloid.
2.
( )
AgI is likely to have positive charge due to adsorption of \({ Ag }^{ + }\) on surface.
3.
( )
shape-selective catalysis: The catalysis which depends upon the pore structure of the catalyst and molecular size of reactant and product molecules is called shape-selective catalysis, e.g. Zeolites are shape-selective catalysis due to their honey- comb structure. ZSM-5 (Zeolite Sieve of Molecular porosity is used to convert methanol into gasoline (petrol).
4.
( )
It will be negatively charged due to adsorption of \({ I }^{ - }\) ions as KI is in excess.
5.
( )
Electrolytes present in sea water coagulate colloidal solution of muddy river water forming deltas.
6.
(d)
MgCl2
7.
(c)
gold
8.
(d)
They are self-stabilized.
9.
(d)
Enthalpy of adsorption \(\left( \triangle { H }_{ adsorption } \right) \) is low and positive
10.
(b)
\(\triangle G<0,\triangle S<0,\triangle H<0\)
11.
( )
physisorption, chemisorption.
12.
( )
20-40
13.
( )
van der Waals forces
14.
( )
activation
15.
( )
exothermic
16.
( )
Osmosis
17.
( )
Electrophoresis
18.
( )
Reverse osmosis
19.
( )
Electrophoresis
20.
( )
Norml electrolyte solution
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