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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 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.
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1.
C6H5NH2 \(\underrightarrow { { NANO }_{ 2 }/HCl } \) X Identify X.
C6H5CI
C6H5NHOH
C6H5N2CI
C6H5OH
2.
Aspirin is _______
benzoyl salicylic acid
acetyl salicylic acid
methyl salicylic
both (b) and (c)
3.
In acidic solution an amino acid, when placed in an electric field__________
moves towards cathode
moves towards the anode
dissociates to cation and anion
does not move either towards the cathode or anode
4.
Ribose is_________
Ketopentose
Ketotetrose
Aldotriose
Aldopentose
5.
The number of optical isomers depend on________.
number of chiral carbon
number of carbon present
number of oxygen present
both (b) and (c)
6.
Starch contains 20% of _________and 80% of______.
ribulose, amylose
mylopectin, amylose
amylose, amylopectin
amylopectin, ribulose
7.
Raffinose on hydrolysis gives
two monosaccharides
three monosaccharides
one disaccharide and one monosaccharide
two monosaccharides and one disaccharide
8.
The organic compound whose balling point is 452K and has the smell of bitter almond is _________.
HCHO
CH3CHO
C6H5CHO
C6H5CH2CHO
9.
Using the data given below find out the strongest reducing agent ______.
\({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
\({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)
Cr
Cr3+
Cl-
Mn2+
10.
In Friedel Craft's reaction of benzoylation of benzene, which of the following acts as a electrophile?
CHCO+
CHO-
CH3CO+
CH3CO-
11.
Silica gel is utilised for the ________of the number of gases.
adsorption
absorption
desorption
all of these
12.
Phenol is used to manufacture _________.
plastics and drugs
explosives and pesticides
antiseptics and germicides
all the above
13.
The general formula for aliphatic ether is ________.
CnH2n+2O
CnH2nO
CnH2n-2O
C2nH2n+1O
14.
The conjugate base of NH-2 is _______.
NH-
NH3
NH+3
NH2-
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 among the following sets of reactants will produce anisole?
HCHO, RMgX
C6H5ONa, CH3Br
C6H5CH3, CH3CoCI
17.
Auto catalysis is observed in the reaction given below.
CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
CH3COOC2H5
H2O
CH3COOH
C2H5OH
18.
Which one of the following structures represents nylon 6,6 polymer?
19.
Which one of the following is not produced by body?
DNA
Enzymes
Hormones
Vitamins
20.
Which of the following reaction is not correct.
CH3 CH2 NH2 \(\overset { { HNO }_{ 2 } }{ \longrightarrow } \)CH3CH2 OH + N2
CH2 CONH2 \(\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } \)CH3 NH2
none of these
21.
Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } \) C 'C' is ______.
anilinium chloride
O – nitro aniline
benzene diazonium chloride
m– nitro benzoic acid
22.
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
Chloroethane and NaOH
ethanol and H2SO4
2 – chloroethan -1-ol and NaHCO3
ethanol and H2O
23.
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-.
24.
How many faradays of electricity are required for the following reaction to occur MnO4-→ Mn2+
5F
3F
1F
7F
25.
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.
acidic, acidic, basic
basic, acidic, basic
basic, neutral, basic
none of these
1.
(c)
C6H5N2CI
2.
(b)
acetyl salicylic acid
3.
(a)
moves towards cathode
4.
(d)
Aldopentose
5.
(a)
number of chiral carbon
6.
(c)
amylose, amylopectin
7.
(b)
three monosaccharides
8.
(c)
C6H5CHO
9.
(a)
Cr
10.
(c)
CH3CO+
11.
(a)
adsorption
12.
(d)
all the above
13.
(d)
C2nH2n+1O
14.
(d)
NH2-
15.
(d)
Smaller the Ka value, greater is the acid strength
16.
(c)
C6H5ONa, CH3Br
17.
(c)
CH3COOH
18.
(d)
19.
(d)
Vitamins
20.
(b)
21.
22.
23.
(b)
It is true, Fe3+ ions coagulate blood which is a negatively charged sol
24.
7MnO4- + 5e- → Mn2+ + 4H2O
5 moles of electrons i.e., 5F charge is required.
25.
HCOONa + HOH ⇌ NaOH + H-COOH
strong base weak acid
Basic in nature.
C6H5NH3Cl + HOH ⇌ H3O+ + C6H5 - NH2 + Cl-
acidic
KCN + H - OH ⇌ KOH + HCN
Base strong base weak acid
basic, acidic, basic is correct.
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