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Published on: 01/11/2019
Surface Chemistry
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.
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 |
2.
On which of the following properties does the coagulating power of an ion depend?
Both magnitude and sign of the charge on the ion.
Size of the ion alone
the magnitude of the charge on the ion alone
the sign of charge on the ion alone.
3.
If x is the amount of adsorb ate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?
x/m = f(P) at constant T
x/m = f(T) at constant P
P = f(T) at constant x/m
x/m = PT
4.
Adsorption of a gas on solid metal surface is spontaneous and exothermic, then ______.
ΔH increases
ΔS increases
ΔG increases
ΔS decreases
5.
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
6.
Match the following
| a | V2O5 | i | High density polyethylene |
| b | Ziegler – Natta | ii | PAN |
| c | Peroxide | iii | NH3 |
| d | Finely divided Fe | iv | H2SO4 |
| A | B | C | D |
| iv | i | ii | iii |
| A | B | C | D |
| i | ii | iv | iii |
| A | B | C | D |
| ii | iii | iv | i |
| A | B | C | D |
| iii | iv | ii | i |
7.
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
8.
Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?
Nitroglycerine
Cellulose acetate
Glycoldinitrate
Nitrocellulose
9.
10.
The phenomenon observed when a beam of light is passed through a colloidal solution is_______.
Cataphoresis
Electrophoresis
Coagulation
Tyndall effect
11.
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+
12.
The most effective electrolyte for the coagulation of As2S3Sol is _______.
NaCl
Ba(NO3)2
K3[Fe(CN)6]
Al2(SO4)3
13.
Which one of the following is correctly matched?
Emulsion - Smoke
Gel - butter
foam - Mist
whipped cream - sol
14.
Hair cream is _____.
gel
emulsion
solid sol
sol.
15.
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-.
16.
Fog is colloidal solution of _______.
solid in gas
gas in gas
liquid in gas
gas in liquid
17.
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.
18.
Which of the following is incorrect for physisorption?
reversible
increases with increase in temperature
low heat of adsorption
increases with increase in surface area
19.
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
20.
Assertion: Coagulation power of Al3+ is more than Na+.
Reason: greater the valency of the flocculating ion added, greater is its power to cause precipitation.
Codes:
a) if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false
if both assertion and reason are true and reason is the correct explanation of assertion.
if both assertion and reason are true but reason is not the correct explanation of assertion
assertion is true but reason is false
both assertion and reason are false
1.
(d)
| A | B | C | D |
| iv | iii | ii | i |
2.
(a)
Both magnitude and sign of the charge on the ion.
3.
(d)
x/m = PT
4.
ΔS is -ve
5.
coagulating power ∝ 1/coagulation value
6.
(a)
| A | B | C | D |
| iv | i | ii | iii |
7.
(d)
Hydrolysis of sucrose in presence of all HCl
8.
Pyroxylin(nitro cellulose)
9.
(b)
10.
Scattering of light
11.
(b)
CH3 -(CH2)15 -NH2
12.
As2S3 is a negatively charged colloid. It will be most effectively coagulated by the cation with greater valency. i.e., Al3+.
13.
(b)
Gel - butter
14.
Emulsion-Dispersed phase
Dispersion meduun -liquid
15.
(b)
It is true, Fe3+ ions coagulate blood which is a negatively charged sol
16.
dispersion medium-gas
dispersed phase-liquid
17.
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.
18.
The incorrect statement is option (n)
Physisorption is an exothermic process. Hence increases in temperature decreases the Physisorption
19.
\(\frac{x}{m}\) = K.p1/n
log \((\frac{x}{m})\) = log K + \(\frac{1}{n}\), log p
y = c + mx
m = 1/n and c = log K
20.
a) if both assertion and reason are true and reason is the correct explanation of assertion.
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