12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions 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.
Silica gel is utilised for the ________of the number of gases.
adsorption
absorption
desorption
all of these
2.
The function of FeCl3 in the conversion of Fe(OH)3 precipitate into a colloid is_________.
peptising agent
emulsifying agent
reducing agent
precipitating agent
3.
The process of hardening of leather is called _______.
coagulation
tanning
centrifuging
stabilization
4.
Butter and cream are examples of________type of emulsion.
O/O
O/W
W/W
W/O
5.
Extent of physisorption of a gas increases with_______.
increase in temperature
decrease in surface area of adsorbent
decrease in pressure
decrease in temperature
6.
Milk of Magnesia is used as _____.
Tranquilizer
Analgesic
Antacid
Anaesthetic
7.
The place where rivers meet the sea is the delta region. Which of the following process is responsible for the formation of delta?
Emulsification
Peptisation
Gel formation
Coagulation
8.
Which one of the following does not involve coagulation?
formation of delta
peptisation
clotting of blood
tanning of leather
9.
Fog is a colloidal solution of _______.
gas in liquid
liquid in gas
gas in solid
solid in gas
10.
Auto catalysis is observed in the reaction given below.
CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
CH3COOC2H5
H2O
CH3COOH
C2H5OH
11.
Which of the following interface cannot be obtained?
solid - solid
solid - liquid
gas - gas
liquid -Iiquid
12.
According to Freundlich adsorption isotherm,_______.
\(\frac { x }{ m } =kp\)
\(\frac { m }{ x } ={ (kp) }^{ \frac { 1 }{ n } }\)
\(\frac { x }{ m } ={ kp }^{ \frac { 1 }{ n } }\)
\(\\ \\ \frac { x }{ m } =\frac { k }{ { p }^{ \frac { 1 }{ n } } } \)
13.
Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.
only (ii)
(ii) and (iii)
only (i)
(i) and (iv)
14.
Adsorption of a gas on solid metal surface is spontaneous and exothermic, then ______.
ΔH increases
ΔS increases
ΔG increases
ΔS decreases
15.
Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?
Nitroglycerine
Cellulose acetate
Glycoldinitrate
Nitrocellulose
16.
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.
Cataphoresis
Electrophoresis
Coagulation
Tyndall effect
17.
The most effective electrolyte for the coagulation of As2S3Sol is _______.
NaCl
Ba(NO3)2
K3[Fe(CN)6]
Al2(SO4)3
18.
Hair cream is _____.
gel
emulsion
solid sol
sol.
19.
Which one of the following characteristics are associated with adsorption?
\(\Delta\)G and \(\Delta\)H are negative but \(\Delta\)S is positive
\(\Delta\)G and \(\Delta\)S are negative but \(\Delta\)H is positive
\(\Delta\)G is negative but \(\Delta\)H and \(\Delta\)S are positive
\(\Delta\)G, \(\Delta\)H and \(\Delta\)S all are negative.
20.
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
\(\frac{1}{n}\), K
log\(\frac{1}{n}\), K
\(\frac{1}{n}\), log K
log \(\frac{1}{n}\), log K
1.
(a)
adsorption
2.
(a)
peptising agent
3.
(b)
tanning
4.
(d)
W/O
5.
(d)
decrease in temperature
6.
(c)
Antacid
7.
(d)
Coagulation
8.
(b)
peptisation
9.
(d)
solid in gas
10.
(c)
CH3COOH
11.
(c)
gas - gas
12.
(c)
\(\frac { x }{ m } ={ kp }^{ \frac { 1 }{ n } }\)
13.
(d)
(i) and (iv)
14.
ΔS is -ve
15.
Pyroxylin(nitro cellulose)
16.
Scattering of light
17.
As2S3 is a negatively charged colloid. It will be most effectively coagulated by the cation with greater valency. i.e., Al3+.
18.
Emulsion-Dispersed phase
Dispersion meduun -liquid
19.
Adsorption leads to decrease in randomnes (entropy).i.e, ΔS < 0 for the adsorption to occur, ΔG slhould be -ve. We know that ΔG = ΔH - TΔS if ΔS is -ve, TΔS is +ve.It means that ΔG will become negative only when ΔH is -ve and ΔH > TΔS.
20.
\(\frac{x}{m}\) = K.p1/n
log \((\frac{x}{m})\) = log K + \(\frac{1}{n}\), log p
y = c + mx
m = 1/n and c = log K
12th Standard Syllabus & Materials
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