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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Four
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.
Amines have __________ odour.
carbolic
mustard oil
fishy
garlic
2.
Insulin is an example of_______hormone.
paracrine
endocrine
autocrine
none of the above
3.
Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.
Clemmenson's reduction
Wolff krishner reduction
Rosenmmunds reduction
catalytic reduction
4.
The intermediate compound formation theory applies to _______reactions.
homogeneous
heterogeneous
both (a)& (b)
none of the above
5.
The drug used to induce sleep is _______________.
paracetamol
bithional
chloroquine
equanil
6.
Which of the following are epimers?
D(+)-Glucose and D(+)-Galactose
D(+)-Glucose and D(+)-Mannose
Neither (a) nor (b)
Both (a) and (b)
7.
Among the following, the reaction that proceeds through an electrophilic substitution is : _______.
8.
Which one of the following reduces tollens reagent
formic acid
acetic acid
benzophenone
none of these
9.
10.
The pH of 10-5M KOH solution will be _______.
9
5
19
none of these
11.
The force that binds a metal ion to a number of electrons within its sphere of influence is known as_________ bond.
covalent
ionic
metallic
co-ordinate
12.
Which one of the following does not belong to AB type?
Cu2O
CsCl
FeS
ZnS
13.
Group 14 elements have general electronic configuration _______.
ns2
ns2np4
ns2np6
ns2np2
14.
CrO3 is coloured due to_______.
Low L.E
Crystal defects
Charge transfer spectra
Unpaired electrons
15.
Identify the metal that occurs in free state.
Al
Au
Mg
Ca
16.
In an octahedral complex, the (n-1) d orbital are involved in hybridization. The complex is called ________ complex.
inner orbital
low spin
spin paired
all the above
17.
The geometry of [Ni(CN)4]2- is _______.
Tetrahedral
Square planar
Triangular
Octahedral
18.
[Fe(H2O)6]3+ and [Fe(CN)6]3- differ in _______.
magnetic nature
co-ordination number
oxidation number
Structure
19.
For a first order reaction, the rate constant is 6.909 min-1 the time taken for 75% conversion in minutes is _______.
\(\left( \frac { 3 }{ 2 } \right) { \log 2 }\)
\(\left( \frac { 2 }{ 3 } \right) \log2\)
\(\left( \frac { 3 }{ 2 } \right) \log\left( \frac { 3 }{ 4 } \right) \)
\(\left( \frac { 2 }{ 3 } \right) \log\left( \frac { 4 }{ 3 } \right) \)
20.
The vacant space in bcc lattice unit cell is ________.
48%
23%
32%
26%
21.
Which one of the following pairs represents linkage isomers?
[Cu(NH3)4][PtCl4] and [Pt(NH3)4][CuCl4]
[Co(NH3)5(NO3)]SO4 and [Co(NH3)5(ONO)]
[Co(NH3)4(NCS)2]Cl and [Co(NH3)4(SCN)2]Cl
both (b) and (c)
22.
A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H2SO4 to a green coloured solution(C). A, B and C are respectively ________.
Na2SO3, SO2, Cr2(SO4)3
Na2S2O3, SO2, Cr2(SO4)3
Na2S, SO2, Cr2(SO4)3
Na2SO4, SO2, Cr2(SO4)3
23.
On hydrolysis, PCl3 gives________.
H3PO3
PH3
H3PO4
POCl3
24.
The element that does not show catenation among the following p-block elements is ________.
Carbon
silicon
Lead
germanium
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)
fishy
2.
(b)
endocrine
3.
(a)
Clemmenson's reduction
4.
(a)
homogeneous
5.
(d)
equanil
6.
(d)
Both (a) and (b)
7.
(b)
8.
9.
(b)
10.
KOH → K+ + OH-
10-5M 10-5M 10-5M
[OH-] = 10-5M
pH = 14 - pOH
pH= 14-(-log [OH-])
= 14 + log [OH-]
= 14 + log 10-5
= 14 - 5 = 9
11.
(c)
metallic
12.
(a)
Cu2O
13.
(d)
ns2np2
14.
(c)
Charge transfer spectra
15.
(b)
Au
16.
(d)
all the above
17.
(b)
Square planar
18.
(a)
magnetic nature
19.
\(k=\frac { 2.303 }{ t } \log\frac { \left[ { A }_{ 0 } \right] }{ \left[ A \right] } \)
[A0] = 100: [A] = 25
\(6.909=\frac { 2.303 }{ t } \log\frac { \left[ {100 } \right] }{ \left[ 25\right] } \)
\(t =\frac { 2.303 }{ 6.909 } \log(4)\)
\(t =\frac { 1 }{ 3 } \log(2^2)\)
\(= \left( \frac { 2 }{ 3 } \right) \log2\)
20.
Packing efficiency = 68%
\(\therefore\)empty space percentage = 100 - 68 = 32%
21.
(a) coordination isomers
(b) no isomerism ( different molecular formula)
(c)⬅NCS; ⬅SCN coordinating atom differs : linkage isomers
22.
(a)
Na2SO3, SO2, Cr2(SO4)3
23.
(a)
H3PO3
24.
(c)
Lead
25.
(c)
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative
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