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 Volume 2 One Mark Questions 2020
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 intermediate formed in the nitration of benzene is _________
Arenium ion
Carbanion
Oxonium ion
Nitrite ion
2.
The reagent that cannot be used for the conversion of C6H5NO2 ➝ C6H5NH2
Sn/HCI
LiAlH4
H2/Ni
Zn/NaOH
3.
Which is not an artificial sweetener is ______
Dulcin
Nectarin
Sucralose
Sodium benzoate
4.
Addition polymerisation is also called as _______ polymerisation.
chain growth
condensation
step growth
none of the above
5.
Pick out the wrong statement among the following.
Antipyretics is used to reduce the body temperature
Analgesics are drugs used to relieve pain
Milk of magnesia is used to relieve symptoms of heat burn
Tetracyclines are antifertility drugs
6.
Nitromethane condenses with acetaldehyde to give
nitro propane
1-nitro-2-propanol
2-nitro-1-propanol
3-nitro propanol
7.
Nitration of nitrobenzene results in
o-dinitrobenzene
1,3,5 trinitrobenzene
m-dinitrobenzene
p-dinitrobenzene
8.
Proteins are found to have two different type of secondary structures, a-helix and P pleated sheet structure a-helix structure of protein is stabilised by_________
peptide bond
vander Waalsforces
hydrogenbonds
dipole - dipole interaction
9.
A dipeptide does not have
two peptide units
portions of two amino acids
an amino group
salt like structure
10.
Which of the statements about electrolytic conductance is not true?
Conductivity increases with decrease in viscosity.
Higher dielectric constant shows lower conductance in solution.
Temperature increases, conductance also increases.
Molar conductance increases with increase in dilution.
11.
When aqueous solution of formaldehyde is evaporated to dryness it forms a polymer called _______.
paraldehyde
paraformaldehyde
bakelite
polyamide
12.
Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?
Ketones
Formaldehyde
Acetaldehyde
Both (a) and (b)
13.
Tyndall effect is a _____ property of colloidal particles.
optical
kinetic
electrical
electronic
14.
is __________
Mesitylene
Pyrogallol
Hydroxy quinol
Phluroglucinol
15.
With regard to the strength of acids and bases, Find the incorrect statement among the following.
Strong acid is one that completely dissociates in water
Ka is the dissociation constant
CH3COOH is a weak acid
Smaller the Ka value, greater is the acid strength
16.
Which one of the following would not react with cone. HCI and anhy. ZnCl2 at room temperature?
(CH3)3COH
(CH3)2CHOH
\({ CH }_{ 3 }-{ CH }_{ 2 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -OH\)
CH3 - CH2 - CH2 - OH
17.
Pick the odd one out.
dialysis
electro dialysis
electrophoresis
ultrafiltration
18.
In a protein, various amino acids linked together by ______.
Peptide bond
Dative bond
\(\alpha\) - Glycosidic bond
\(\beta\) - Glycosidic bond
19.
Among the following ethers which one will produce methyl alcohol on treatment with hot HI?
(H3C)3C-O-CH3
(CH3-)2-CH-CH2-O-CH3
CH3-(CH2)3-O-CH3
CH3-CH2-\(\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } \)-O-CH3
20.
(CH3)3-C-CH(OH) CH3 \(\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow } \)X (major product)
(CH3)3 CCH = CH2
(CH3)2C = C (CH3)2
CH2= C(CH3)CH2-CH2- CH3
CH2= C (CH3) - CH2- CH2- CH3
21.
The most effective electrolyte for the coagulation of As2S3Sol is _______.
NaCl
Ba(NO3)2
K3[Fe(CN)6]
Al2(SO4)3
22.
A current strength of 3.86 A was passed through molten Calcium oxide for 41 minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is_______. (atomic mass of Ca is 40g / mol and 1F = 96500C).
4
2
8
6
23.
What is the decreasing order of strength of bases
OH, NH2- H - C ≡ C and CH3 - CH2-
OH->NH2- >H-C≡C >CH3-CH2-
NH2->OH->CH3-CH2- >H-C≡C
CH3-CH2->NH2->H-C≡C->OH-
OH->H-C ≡ C->CH3-CH2- >NH2-
24.
Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (-CHO) group is meta directing.
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
25.
Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
Reason: 2 – 2, dimethyl propanoic acid does not have \(\alpha\) - hydrogen atom
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.
(a)
Arenium ion
2.
(d)
Zn/NaOH
3.
(a)
Dulcin
4.
(a)
chain growth
5.
(d)
Tetracyclines are antifertility drugs
6.
(b)
1-nitro-2-propanol
7.
(c)
m-dinitrobenzene
8.
(c)
hydrogenbonds
9.
(a)
two peptide units
10.
(b)
Higher dielectric constant shows lower conductance in solution.
11.
(b)
paraformaldehyde
12.
(d)
Both (a) and (b)
13.
(a)
optical
14.
(d)
Phluroglucinol
15.
(d)
Smaller the Ka value, greater is the acid strength
16.
(d)
CH3 - CH2 - CH2 - OH
17.
(c)
electrophoresis
18.
(a)
Peptide bond
19.
20.
(CH3)2C = C (CH3)2
21.
As2S3 is a negatively charged colloid. It will be most effectively coagulated by the cation with greater valency. i.e., Al3+.
22.
mg = ZIt
\(= \frac{40 \times 3.86 \times 2500}{2 \times 96500} = 2g\)
(∵ t = 41 min 40 sec = 2500 seconds & \(Z = \frac{m}{n \times 96500} = \frac{40}{x \times 96500})\)
23.
(c)
CH3-CH2->NH2->H-C≡C->OH-
24.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
25.
A) if both assertion and reason are true and reason is the correct explanation of assertion.
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
