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Published on: 13/10/2020
12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test
1.
When the operation force between the absorbent and adsorbate is weak Vander waal's force, then it is called _______.
physical adsorption
chemical adsorption
Vander waal's adsorption
both (a) and (c)
2.
| Dispersed Phase | Dispersion Medium | Name |
| Liquid | X | Liquid Aerosol |
| Y | Solid | Solid form |
The X and Y are ______ and _____.
Gas, Liquid
Gas, Solid
Gas, Gas
Solid, Gas
3.
This adsorption is irreversible _______.
Vanderwaal's adsorption
Physical adsorption
Chemical adsorption
All the above
4.
Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is _______.
O/W
W/O
O/O
W/W
5.
Colloidal medicines are more efffective because _______.
they are clean
they are easy to prepare
the germs move towards them
they are easily assimilated and adsorbed
6.
The phenomenon of Tyndall's effect is not observed in _______.
emulsion
colloidal solution
true solution
none
7.
Which among the following is/are solid aerosol?
(i) Dust
(ii) Fog
(iii) Aerosol spray
(iv) Air
(i) and (iv)
(iii) and (iv)
(i) and (iii)
only (iii)
8.
Which one of the following is correctly matched?
Emulsion - Mayonnaise
Foam - Cream
Solid aerosol - Fog
Solid sol - Pumice stone
9.
The intermediate compound formation theory does not explain _______.
action of catalytic poison
specificity of a catalyst
the mechanism of heterogeneous catalysed reactions
both (a) and (c)
10.
Which among the following reactions is an example of auto catalysis?
i) CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
ii) 2H2O➝2H2O+O2
iii) 2SO2+O2➝2SO3
iv) 2AsH3➝2As+3H2
only (i)
(i) and (ii)
(i) and (ii)
(i) and (iv)
11.
Adsorption is accompanied by _______.
decrease in free energy
increase in free energy
increase in entropy
both (b) and (c)
12.
Which of the following is true regarding Freundlich adsorption isotherm equation?
Purely empirical
Valid only over a limited pressure range
The value of constants k and n varies with temperature
All the above
13.
Which among the following does not affect adsorption?
surface area of the adsorbent
catalyst
temperature
pressure
14.
Match the following
| a | Pure nitrogen | i | Chlorine |
| b | Haber process | ii | Sulphuric acid |
| c | Contact process | iii | Ammonia |
| d | Deacons Process | iv | Sodium azide (or) Barium azide |
Which of the following is the correct option?
| A | B | C | D |
| i | ii | iii | iv |
| A | B | C | D |
| ii | iv | i | iii |
| A | B | C | D |
| iii | iv | ii | i |
| A | B | C | D |
| iv | iii | ii | i |
15.
The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below
(I) (NaCl) = 52
(II) ((BaCl2) = 0.69
(III) (MgSO4) = 0.22
The correct order of their coagulating power is ________.
III > II > I
I > II > III
I > III > II
II > III > I
16.
Which one of the following is an example for homogeneous catalysis?
manufacture of ammonia by Haber’s process
manufacture of sulphuric acid by contact process
hydrogenation of oil
Hydrolysis of sucrose in presence of all HCl
17.
Which one of the is not a surfactant?
CH3 -(CH2)15 -N+ -(CH3)2 CH2Br
CH3 -(CH2)15 -NH2
CH3 -(- CH2- )-16CH2 OSO2- Na+
OHC-(CH2)14 -CH2 -COO- Na+
18.
Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?
It is not true, ferric chloride is a poison.
It is true, Fe3+ ions coagulate blood which is a negatively charged sol
It is not true; ferric chloride is ionic and gets into the blood stream.
It is true, coagulation takes place because of formation of negatively charged sol with Cl-.
19.
Fog is colloidal solution of _______.
solid in gas
gas in gas
liquid in gas
gas in liquid
20.
Which of the following is incorrect for physisorption?
reversible
increases with increase in temperature
low heat of adsorption
increases with increase in surface area
1.
(d)
both (a) and (c)
2.
(c)
Gas, Gas
3.
(c)
Chemical adsorption
4.
(a)
O/W
5.
(d)
they are easily assimilated and adsorbed
6.
(c)
true solution
7.
(a)
(i) and (iv)
8.
(a)
Emulsion - Mayonnaise
9.
(d)
both (a) and (c)
10.
(d)
(i) and (iv)
11.
(a)
decrease in free energy
12.
(d)
All the above
13.
(b)
catalyst
14.
(d)
| A | B | C | D |
| iv | iii | ii | i |
15.
coagulating power ∝ 1/coagulation value
16.
(d)
Hydrolysis of sucrose in presence of all HCl
17.
(b)
CH3 -(CH2)15 -NH2
18.
(b)
It is true, Fe3+ ions coagulate blood which is a negatively charged sol
19.
dispersion medium-gas
dispersed phase-liquid
20.
The incorrect statement is option (n)
Physisorption is an exothermic process. Hence increases in temperature decreases the Physisorption
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