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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 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
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1.
Oxidation of aniline with acidified K2Cr2O7 gives ___________
p-benzoquinone
benzoic acid
benzaldehyde
benzyl alcohol
2.
\(\mathrm{CH}_{3} \mathrm{CONH}_{2} \stackrel{\mathrm{Br}_{2} / \mathrm{KHO}}{\longrightarrow} \mathrm{CH}_{5} \mathrm{H}_{2} +\mathrm{CO}_{2}\). This is _________ reaction.
Hoffman bromamide
HVZ
Gabriel phthalimide
Gomberg Bachmann
3.
The reagent that cannot be used for the conversion of C6H5NO2 ➝ C6H5NH2
Sn/HCI
LiAlH4
H2/Ni
Zn/NaOH
4.
Which of the following will not undergo Hoffman's bromamide reaction?
Ethanamide
Propanamide
Methanamide
Phenyl methanamide
5.
Which among the following is a tertiary nitro compound?
\({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { NO }_{ 2 } } }{ C } } -{ CH }_{ 3 }\)
\({ CH }_{ 2 }-\overset { \underset { | }{ { NO }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)
CH3CH2CH2 - NO2
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }{ NO }_{ 2 }\)
6.
The reduction of CH3 - CH2 - C ☰ N with sodium and alcohol results in the formation of
\({ CH }_{ 3 }-\underset { \overset { | }{ { NH }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)
CH3- CH2- CH2- OH + N2
CH3 - CH2 - CH2 - NH2
CH3 - CH2 - NH2
7.
The optically inactive amino acid is_______
glycine
alanine
proline
phenylalanine
8.
Ribose is_________
Ketopentose
Ketotetrose
Aldotriose
Aldopentose
9.
Sucrose is commonly known as_________
fruit sugar
table sugar
grape sugar
table salt
10.
The order of reactivity of carboxylic acid derivatives is _______.
Acid chloride > Ester > Amide > Acid anhydride
Acid chloride > Acid anhydride > Ester > Amide
Acid chloride > Amide > Acid anhydride > Ester
Acid anhydride > Ester > Amide > Acid chloride
11.
The emf generated by an electrochemical cell is given by the symbol ______.
E
M
F
S
12.
Primary alcohol on oxidation gives _______.
aldehyde
ketones
both (a) and (b)
neither
13.
Chloretone is an addition product of _______.
CH3CHO, HCHP
CH3CHO, CHCl3
\({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CCl }_{ 4 }\)
\(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)
14.
The oxidation of sodium sulphite by air is retarded by _______.
MnO2
H2S
Alcohol
AS2O3
15.
The common name for 4-hydroxy toluene is ________.
p-cresol
m-cresol
resoricinol
catechol
16.
Kw represents _______.
ionic product constant of water
Solubility product of water
Equilibrium constant of water
Buffer index
17.
Secondary alcohol on oxidation gives ______.
aldehyde
ketone
ester
anhydride
18.
Helium is used in balloons in the place of hydrogen because it is________.
incombustible
radioactive and detected easily
lighter than hydrogen
both (a) and (c)
19.
The number of chloride ions that surrounds the central Na ion in NaCl crystal is_______.
12
8
6
4
20.
Sodium cyanide solution is used to extract _________from its ores
copper
silver
gold
both (b) and (c)
21.
Which is a double salt?
K2SO4AI2(SO4)324H2O
NaCI
K4[Fe(CN)6]
KCl
22.
XeF6 on complete hydrolysis produces________.
XeOF4
XeO2F2
XeO3
XeO2
23.
The basicity of pyrophosphorous acid ( H4P2O5) is _______.
4
2
3
5
24.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
25.
Zinc is obtained from ZnO by________.
Carbon reduction
Reduction using silver
Electrochemical process
Acid leaching
1.
(a)
p-benzoquinone
2.
(a)
Hoffman bromamide
3.
(d)
Zn/NaOH
4.
(a)
Ethanamide
5.
(a)
\({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { NO }_{ 2 } } }{ C } } -{ CH }_{ 3 }\)
6.
(c)
CH3 - CH2 - CH2 - NH2
7.
(a)
glycine
8.
(d)
Aldopentose
9.
(b)
table sugar
10.
(b)
Acid chloride > Acid anhydride > Ester > Amide
11.
(a)
E
12.
(a)
aldehyde
13.
(d)
\(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)
14.
(c)
Alcohol
15.
(a)
p-cresol
16.
(a)
ionic product constant of water
17.
(b)
ketone
18.
(d)
both (a) and (c)
19.
(c)
6
20.
(d)
both (b) and (c)
21.
(a)
K2SO4AI2(SO4)324H2O
22.
(c)
XeO3
23.
(b)
2
24.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
25.
(a)
Carbon reduction
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