12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Five
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.
The electrical energy produced by a cell equals _______.
Ecathode - Eanode
\(\frac{Charge \ of \ electrons}{E_{cell}}\)
Charge of electrons x Ecell
\(\frac{E_{cell}}{Charge \ of \ electrons}\)
2.
Tincture benzoin is obtained from _______.
benzoyl chloride
benzoin
benzyl alcohol
benzoic acid
3.
Extent of physisorption of a gas increases with_______.
increase in temperature
decrease in surface area of adsorbent
decrease in pressure
decrease in temperature
4.
Identify the major product in the given reaction
5.
In swern method of oxidation of alcohols to aldhedye/ ketones _______ is used as an oxidising agent.
dimethyl sulfoxide
pyridimium chloro chromate
CrO3 in anhydrousmedium
Na2Cr2O7 |H+
6.
Complete the reaction 
none
7.
Acetone
Isobutylene
Acetic anhydride
Ethyl alcohol
8.
Regarding cross-linked or network polymers, which of the following statement is incorrect?
Examples are Bakelite and melamine
They are formed from bi and tri-functional monomers
They contain covalent bonds between various linear polymer chains
They contain strong covalent bonds in their polymer chain
9.
Which of the following statement is correct?
Ovalbumin is a simple food reserve in egg-white
Blood proteins thrombin and fibrinogen are involved in blood clotting
Denaturation makes protein more active
Insulin maintains the sugar level of in the human body
10.
Among the following, the reaction that proceeds through an electrophilic substitution is : _______.
11.
In which case chiral carbon is not generated by reaction with HCN?
12.
Identify the product formed in the reaction
13.
The reactions
is an example of ______.
Wurtz reaction
cyclic reaction
Williamson reaction
Kolbe reactions
14.
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
15.
Faraday constant is defined as_______.
charge carried by 1 electron
charge carried by one mole of electrons
charge required to deposit one mole of substance
charge carried by 6.22 ×1010 electrons
16.
The solubility of BaSO4 in water is 2.42 × 10-3gL-1 at 298K. The value of its solubility product(Ksp) will be (Given molar mass of BaSO4 =233g mol-1)
1.08 × 10-14mol2L-2
1.08 × 10-12mol2L-2
1.08 × 10-10mol2L-2
1.08 × 10-8mol2L-2
17.
The rate of a reaction is expressed as k[A]2[B]1, the reaction is said to be _____.
second order with respect to A
first order with respect to B
overall order of the reaction is third order
all the above
18.
A crystal which has the same unit cell and contains the same lattice points throughout the crystal is_________.
perfect
imperfect
distorted
both (b) and (c)
19.
The diffraction of crystal of Ba with X-ray of wavelength 2.29\(\mathring { A } \) gives a first order reflection at 27°8. What is the distance between the diffracted patterns?
5.02 \(\mathring { A } \)
0.398 \(\mathring { A } \)
2.51 \(\mathring { A } \)
10.04 \(\mathring { A } \)
20.
Aluminium is used for making alloys because of its _____
resistance to corrosion
poor conductivity
heaviness
all of these
21.
Zinc blende is_______.
ZnS
PbS
Ag2S
Cu2S
22.
An example of a chelating ligand is _______.
NO-2
Chloro
Bromo
en
23.
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK-1 mol-1)
234.65 kJ mol-1
434.65 kJ mol-1
2.305 kJ mol-1
334.65 J mol-1
24.
The basicity of pyrophosphorous acid ( H4P2O5) is _______.
4
2
3
5
25.
1.
(c)
Charge of electrons x Ecell
2.
(b)
benzoin
3.
(d)
decrease in temperature
4.
(c)
5.
(a)
dimethyl sulfoxide
6.
(c)
7.
(b)
Isobutylene
8.
(d)
They contain strong covalent bonds in their polymer chain
9.
(c)
Denaturation makes protein more active
10.
(b)
11.
12.
13.
(c)
Williamson reaction
14.
coagulating power ∝ 1/coagulation value
15.
IF = 96500 C = charge of one mole of e- charge of 6.022 x 10-23 electron
16.
BaSO4 ⇌ Ba2+ + SO42-
Ksp = (s) (s)
Ksp = (s)2
= (2.42 × 10-3gL-1)2
\(=\frac{2.42 \times 10^{-3} gL^{-1}}{233 \text{ g mol}^{-1}}\)
= (0.01038 x 10-3)2
= (1.038 x x 10-5)2
= 1.077 x 10-10
= 1.08 × 10-10mol2L-2
17.
(d)
all the above
18.
(a)
perfect
19.
(b)
0.398 \(\mathring { A } \)
20.
(a)
resistance to corrosion
21.
(a)
ZnS
22.
(d)
en
23.
T1= 200 K ; k = k1
T2 =400 K ; k1 = k2 = 2k1
log\(\frac {{ k }_{ 2 } }{ { k }_{ 1 } } =\frac { { E }_{ a } }{ 2.303R } \left[ \frac { { T }_{ 2 }-{ T }_{ 1 } }{ { T }_{ 1 }{ T }_{ 2 } } \right] \)
log \( [\frac {{2 k }_{ 1 } }{ { k }_{ 1 } }]\)
\(= \left[ \frac { E_{a} }{ 2.303\times 8.314 JK^{-1} mol^{-1} } \right] \)
\(= \left[ \frac { 400 k - 200K }{200 k \times 400 k } \right] \)
\(E_{a} = \frac{ 0.3010 \times 2.303 \times 8.314 JK^{-1}mol^{-1} \times 200K \times 400 K}{200 K}\)
Ea = 2305 J mol-1
Ea = 2.305 kJ mol-1
24.
(b)
2
25.
(b)
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு எடுத்துக்காட்டுகள் மற்றும் நெறிமுறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications கணினி வலையமைப்பு ஓர் அறிமுகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications PHP-உடன் MySQL-ஐ இணைத்தல் Sample Question Papers Study Material - QB365 Set A
Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
Tamilnadu Stateboard Standards
