12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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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 One Mark Questions with Answer Key 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.
(CH3)2 - CH - NO when boiled with HCI/H2O gives compound 'X'. Identify 'X'.
CH3COOH
(CH3)2C = 0
CH3CHO
CH3NO2
2.
Complete the reaction \(\underset { \overset { | }{ { CH }_{ 3 }-CHOH } }{ { CH }_{ 3 }-CHOH } \overset { { HIO }_{ 4 } }{ \underset { ? }{ \longrightarrow } } X\) is _________.
CH3COCH3
CH3CHO
C6H5CHO
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CH-CHO\)
3.
Benzoic acid, when heated with soda lime gives _________.
C6H5COONa
C6H5COOC6H5
C6H6
C6H5OH
4.
Which among the following reactions will not result in the formation of carbon - carbon bond?
Friedel Craft
Cannizaro reaction
Riemer - Tiemann
None of the above
5.
Reduction of RCHO to RCH3 by N2H4 in C2H5ONa is _________ reaction.
Stephen reduction
Catalytic reduction
Clemmensen reduction
Wolff-kishner reduction
6.
λc = μc for, ______.
NaCI
H2SO4
Na2SO4
Al2(SO4)3
7.
On Kolbe's electrolysis, formic acid gives _______.
H2
methane
ethane
none
8.
In Friedel Craft's reaction of benzoylation of benzene, which of the following acts as a electrophile?
CHCO+
CHO-
CH3CO+
CH3CO-
9.
Identify 'X'.
10.
A substance which destroys the activity of a catalyst is_______.
negative catalyst
catalytic poison
both (a) and (b)
promoter
11.
With concentrated sulphuric acid, glycol undergoes intermolecular dehydration to give cyclic compound ______.
diethylene glycol
dioxan
paraldehyde
glyoxal
12.
Identify X in the sequence give below
13.
A certain current liberated 0.504gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ______.
31.75
15.8
7.5
63.5
14.
In any unimolecular reaction _____.
Only two reacting species is involved in the rate determining step.
The order and the molecularity of slowest step are equal to one.
The molecularity of the reaction is one and order is zero.
Both molecularity and order of the reaction are one.
15.
An excess of potassium ion makes KCl crystals appear violet since _______.
Some of anionic sites are occupied by unpaired electron
Anionic sites are occupied by pair of electrons
both (a) and (b)
neither (a) nor (b)
16.
The ionisation isomer of [Cr(H2O)4CI(NO2)]Cl is _________.
[Cr(H2O)4Cl2(NO)2]
[Cr(H2O)4Cl2]NO2
[Cr(H2O)4Cl(ONO)]
both (a) and (b)
17.
The coordination number of Ni(II) in [Ni(CN)4]2- is _______.
2
4
5
0
18.
19.
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)________.
6.023 x 1023
6.023 x 1022
60.23 x 1023
\(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)
20.
Most easily liquefiable gas is _______.
Ar
Ne
He
Kr
21.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
22.
Which of the following is used for concentrating ore in metallurgy?
Leaching
Roasting
Froth floatation
Both (a) and (c)
23.
Assertion: Phenol is more acidic than ethanol
Reason: Phenoxide ion is resonance stabilized
Codes:
a) both assertion and reason are true and reason is the correct explanation of assertion.
b) 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.
24.
Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis.
Reason: Ce4+ has the tendency of attaining +3 oxidation state.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) 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.
Both assertion and reason are true and reason is the correct explanation of assert
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.
(b)
(CH3)2C = 0
2.
(b)
CH3CHO
3.
(c)
C6H6
4.
(b)
Cannizaro reaction
5.
(d)
Wolff-kishner reduction
6.
(a)
NaCI
7.
(a)
H2
8.
(c)
CH3CO+
9.
(c)
10.
(b)
catalytic poison
11.
(b)
dioxan
12.
(a)
13.
\(\frac{m_{1}}{m_{2}} = \frac{E_{1}}{E_{2}} \)
\(\frac{0.504}{m_{2}} = \frac{1.008}{31.77} \)
m2 = 15.885 g
14.
(d)
Both molecularity and order of the reaction are one.
15.
(a)
Some of anionic sites are occupied by unpaired electron
16.
(b)
[Cr(H2O)4Cl2]NO2
17.
(b)
4
18.
(a)
19.
In bcc unit cell,
2 atoms = 1 unit cell
Number of atoms in 8 g of element is, Number of moles = 8g / 40 g mol-1 = 0.2 mol
1 mole contains 6.023 x1023 atoms
0.2 mole contains 0.2 x 6.023 x 1023 atoms
[1 unit cell / 2 atoms] x 0.2 x 6.023 x 1023
= 6.023 x 1022 unit cells.
20.
(d)
Kr
21.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
22.
(d)
Both (a) and (c)
23.
a) both assertion and reason are true and reason is the correct explanation of assertion.
24.
a) Both assertion and reason are true and reason is the correct explanation of assertion.
12th Standard Syllabus & Materials
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