12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

Published on: 05/11/2020
12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 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.
Questions + Answers key
Take MCQ Chemistry Test

1.
On hydrolysis nitro ethane gives
methyl amine and hydroxyl amine
acetic acid and methyl amine
acetic acid and hydroxyl amine
formic acid and hydroxyl amine
2.
The drug used in major surgical procedure is ________
procaine
lidocaine
propofol
morphine
3.
The precipitation of protein is called_________
peptisation
denaturation
renaturation
none of these
4.
Primary structure of proteins refer to _________.
amino acid present
the shape of protein molecule
the peptide bond
the sequence of amino acid
5.
Nucleic acid is made up of__________
an organicbase
a sugar unit
phosphoric acid
all of these
6.
A mixture of D (+) glucose and D (-) fructose is known as__________.
cane sugar
sweetless sugar
invert sugar
starch sugar
7.
Pick the vitamin among the following acids?
Ascorbic acid
Acetic acid
Cinnamic acid
Aspartic acid
8.
An example of non-protein amino acid is
Alanine
orinithine
proline
serine
9.
Acetic acid when heated with HI/P gives_______.
methane
ethane
propane
acetaldehyde
10.
A solution which is resistant to changes of pH on addition of small amounts of an acid or a base is known as _______.
buffer solution
true solution
Isohydric solution ideal solution
ideal solution
11.
Lucas test is used to distinguish 10, 20 and 30 ______.
amines
nitro compound
alcohols
all the above
12.
The Tyndall's effect associated with colloidal particles is due to _______.
presence of charge
scattering of light
absorption of light
reflection of light
13.
Which one of the following is not produced by body?
DNA
Enzymes
Hormones
Vitamins
14.
pH of a saturated solution of Ca(OH)2 is 9. The Solubility product (Ksp) of Ca(OH)2 _______.
0.5 × 10-15
0.25 × 10-10
0.125 × 10-15
0.5 × 10-10
15.
Activation energy of a reactant is reduced by ________.
increased temperature
reduced temperature
increased pressure
reduced pressure
16.
Amorphous solids can also be called _______.
pseudo solids
true solids
super cooled liquids
both (a) & (c)
17.
On moving down the group 13, density ______
decreases
increases
First decreases then increases
remains same
18.
IUPAC name of H2[Ptcl6] is _______.
Hexa chloridoplatinum (IV) acid
Hexa chloridoplatinum (IV) acid
Hexachloridoplatinic (IV) acid
Dihydrogenhexaehloro platinate (IV)
19.
For the reaction, 2NH3 ⟶ N2 + 3H2, if \(\frac { -d[NH_{ 3 }] }{ dt } \) = k1[NH3], \(\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt } \)= k3[NH3] then the relation between k1, k2 and k3 is _________.
k1 = k2 = k3
k1 = 3k2 = 2k3
1.5k1 = 3k2 = k3
2k1 = k2 = 3k3
20.
A complex in which the oxidation number of the metal is zero is_______.
K4[Fe(CN)6]
[Fe(CN)3(NH3)3]
[Fe(CO)5]
both (b) and (c)
21.
Permanganate ion changes to ________ in acidic medium.
MnO42−
Mn2+
Mn3+
MnO2
22.
Among the following the correct order of acidity is ________.
HClO2 < HClO < HClO3 < HClO4
HClO4 < HClO2 < HClO < HClO3
HClO3 < HClO4 < HClO2 < HClO
HClO < HClO2 < HClO3 < HClO4
23.
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
24.
Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (-CHO) group is meta directing.
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if 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
1.
(c)
acetic acid and hydroxyl amine
2.
(c)
propofol
3.
(b)
denaturation
4.
(d)
the sequence of amino acid
5.
(d)
all of these
6.
(c)
invert sugar
7.
(a)
Ascorbic acid
8.
(b)
orinithine
9.
(b)
ethane
10.
(a)
buffer solution
11.
(c)
alcohols
12.
(b)
scattering of light
13.
(d)
Vitamins
14.
Ca(OH)2 ⇌ Ca2+ + 2OH-
Given that pH = 9
pOH = 14 - 9 = 5
[pOH = - log10 [OH]]
[OH-] = 10 [pOH]
[OH] = 10-5 M
Ksp = [Ca2+] [OH-]
= 10-5/2 x (10-5)2 = 0.5 x 10-15
15.
(a)
increased temperature
16.
(d)
both (a) & (c)
17.
(b)
increases
18.
(d)
Dihydrogenhexaehloro platinate (IV)
19.
\(Rate=\frac { -1 }{ 2 } \frac { d[NH_3] }{ dt } \)
\(\frac { -d\left[ { N }_{ 2 } \right] }{ dt } =\frac { 1 }{ 3 } \frac { d\left[ { H}_{ 2 } \right] }{ dt } \)
\(=\frac { 1 }{ 2 } { k_1\left[ { NH}_{ 3 } \right] } = { k_2 \left[ { NH}_{ 3 } \right] }=\frac { 1 }{ 3 } { k_3\left[ { NH}_{ 3 } \right] } \)
[3/2] k1 = 3k2 = k3
1.5k1 = 3k2 = k3
20.
a) Fe2+ b) Fe3+ c) Fe0
21.
MnO-4 + 8H+ + 5e- → Mn2+ + 4H2O
22.
(d)
HClO < HClO2 < HClO3 < HClO4
23.
(b)
B3H6
24.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு எடுத்துக்காட்டுகள் மற்றும் நெறிமுறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications கணினி வலையமைப்பு ஓர் அறிமுகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications PHP-உடன் MySQL-ஐ இணைத்தல் Sample Question Papers Study Material - QB365 Set A
Tamilnadu Stateboard 12th Standard Subjects

Maths

Chemistry

Physics

Biology

Computer Science

Business Maths and Statistics

Economics

Commerce

Accountancy

History

Computer Applications

Biology

Computer Technology

Computer Applications

Computer Science

Business Maths and Statistics

Commerce

Economics

Maths

Chemistry

Physics

Computer Technology

History

Accountancy

Tamil

English

French
Tamilnadu Stateboard Standards