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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Nine
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.
The basic character of amines is due to the
tetrahedral structure
presence of nitrogen atom
lone pair of electrons on nitrogen atom
high electronegativity of nitrogen
2.
Nitromethane condenses with acetaldehyde to give
nitro propane
1-nitro-2-propanol
2-nitro-1-propanol
3-nitro propanol
3.
Which among the following exists as zwitter ion?
sulphanilic acid
salicylic acid
acetanilide
all the above
4.
Which of the following cannot be prepared by Sandmeyer's reaction?
Iodobenzene
Fluorobenzene
both Iodobenzene and Fluorobenzene
neither Iodobenzene and Fluorobenzene
5.
Nitration of nitrobenzene results in
o-dinitrobenzene
1,3,5 trinitrobenzene
m-dinitrobenzene
p-dinitrobenzene
6.
Aldol is _________.
2-hydroxy butanol
3 -hydroxy butanol
3- hydroxy butanal
2 -hydroxy butanal
7.
Benzoin is _________.
an ∝ -hydroxy aldehyde
β- hydroxy aldehyde
β-hydroxy ketone
α - hydroxy ketone
8.
Acetone reacting with HCN to form cyanohydrin is ________ type of reaction.
Nucleophilic addition
Electrophilic substitution
Freeradical substitution
Redox
9.
Which is unstable?
HCOOH
CH3CH2COCl
CH3COCl
HCOCl
10.
Give the stucture of 3-phenyl-2-propanal _______.
CH2=CH-CHO
CH3CHOH-CH2CHO
C6H5CH=CH-CHO
CH3-CH=CH-CHO
11.
When acetaldehyde is heated with Fehling's solution, it gives a precipitate of _______.
Cu2O
CuO
CuO + Cu2O
Cu
12.
The IUPAC name of the compound
4 - methoxy - 2 - nitro benzaldehyde
4 methoxy - 6 - nitro benzaldehyde
2 - formyl- 5 - methoxynitrobenzene
4 formyl - 5 - nitroanisole
13.
The number of possible isomers for molecular formula C3H8O is _______.
2
3
7
4
14.
Oxidation of glycerol with bismuth nitrate gives ________.
meso-oxalic acid
glyceric acid
tartronic acid
both (b) and (c)
15.
The active component of dynamite is _______.
keiselghur
nitro glycerine
nitro benzene
trinitro toluene
16.
The IUPAC name of 
is _______.
2-methoxy propane
ethoxy benzene
2-methoxy-2-methyl propane
2-methyl-l-butane
17.
Consider the following reaction 
X, Y and Z respectively are ________.
C2H4, C2H5COCI, C2H5OH
18.
Which of the following produces ether, when heated with cone, H2SO4 at 413 K?
Organic acid
Aldehyde
Alcohol
Ketone
19.
Higher alcohols are not soluble in water because of ______.
hydrophilic alkyl group
hydrophobic alkyl groups
hydrophilic aryl group
hydrophobic aryl groups
20.
Williamson synthesis of preparing dimethyl ether is a / an ______.
SN1 reactions
SN2 reaction
electrophilic addition
electrophilic substitution
21.
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.
22.
The primary and secondary valencies of [CoCl2(en)2]SO4 are respectively_________.
4, 6
2, 4
4, 4
6, 4
23.
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
\(\left( \frac { 1 }{ 2 } a;\frac { \sqrt { 3 } }{ 2 } a;\frac { \sqrt { 2 } }{ 2 } a \right) \)
\(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)
\(\left( \frac { 1 }{ 2 } a:\frac { \sqrt { 3 } }{ 4 } a:\frac { 1 }{ 2\sqrt { 2 } } a \right) \)
\(\frac { 1 }{ 2 } a:\sqrt { 3 } a:\frac { 1 }{ \sqrt { 2 } } a\)
24.
Which of the following statements is not true?
on passing H2S, through acidified K2Cr2O7 solution, a milky colour is observed
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
K2Cr2O7 solution in acidic medium is orange in colour
K2Cr2O7 solution becomes yellow on increasing the PH beyond 7
25.
In the Ellingham diagram, for the formation of carbon monoxide________.
\(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \) is negative
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative
initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative
1.
(c)
lone pair of electrons on nitrogen atom
2.
(b)
1-nitro-2-propanol
3.
(a)
sulphanilic acid
4.
(c)
both Iodobenzene and Fluorobenzene
5.
(c)
m-dinitrobenzene
6.
(c)
3- hydroxy butanal
7.
(d)
α - hydroxy ketone
8.
(a)
Nucleophilic addition
9.
(d)
HCOCl
10.
(c)
C6H5CH=CH-CHO
11.
(b)
CuO
12.
(a)
4 - methoxy - 2 - nitro benzaldehyde
13.
(b)
3
14.
(a)
meso-oxalic acid
15.
(b)
nitro glycerine
16.
(c)
2-methoxy-2-methyl propane
17.
(a)
18.
(c)
Alcohol
19.
(b)
hydrophobic alkyl groups
20.
(b)
SN2 reaction
21.
(a)
Both magnitude and sign of the charge on the ion.
22.
(a)
4, 6
23.
sc ⇒ 2r = a
⇒ r = a/2
bcc ⇒ 4r = \( \sqrt{3a} \) ⇒ r = \(\frac { \sqrt{3a}} {4}\)
fcc ⇒ 4r ⇒ \( \sqrt{2a} \) ⇒ r = \(\frac { \sqrt{2a}} {4} = \frac { a} {2\sqrt{2a}}\)
\(\left( \frac { a }{ 2 } :\frac { \sqrt { 3 } }{ 4 } a:\frac { a }{ 2\sqrt { 2 } } \right) \)
24.
(b)
Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
25.
(c)
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative
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