12th Standard Chemistry English Medium Important 1 Mark Creative Questions (New Syllabus) 2020

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:

Multiple Choice Question

90 x 1 = 90

Oxidation of aniline with acidified K₂Cr₂O₇ gives ___________

(a)

p-benzoquinone

(b)

benzoic acid

(c)

benzaldehyde

(d)

benzyl alcohol

Which among the following is a tertiary amine?

(a)

(CH₃)₃-C-NH₂

(b)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ NH }-{ CH }_{ 3 }\)

(c)

(CH₃)₂-N-C₂H₅

(d)

\({ CH }_{ 2 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { NH }_{ 2 } } }{ C } } -C_{ 2 }{ H }_{ 3 }\)

The test for aniline is

(a)

Fehling's test

(b)

Ferric chloride test

(c)

Bromination test

(d)

Riemer Tiemann test

Addition polymerisation is also called as _______ polymerisation.

(a)

chain growth

(b)

condensation

(c)

step growth

(d)

none of the above

Which one of the following is employed as antihistamine?

(a)

azithromycin

(b)

ciprofloxacin

(c)

cetirizine

(d)

neomycin

When nitromethane is reduced with Zn dust + NH₄ CI in neutral medium, we get

(a)

CH₃NH₂

(b)

C₂H₅NH₂

(c)

CH₃NHOH

(d)

C₂H₅COOH

(CH₃)₂ - CH - NO when boiled with HCI/H₂O gives compound 'X'. Identify 'X'.

(a)

CH₃COOH

(b)

(CH₃)₂C = 0

(c)

CH₃CHO

(d)

CH₃NO₂

Proteins are found to have two different type of secondary structures, a-helix and P pleated sheet structure a-helix structure of protein is stabilised by_________

(a)

peptide bond

(b)

vander Waalsforces

(c)

hydrogenbonds

(d)

dipole - dipole interaction

Pyridoxine is__________

(a)

vitamin B₆

(b)

vitamin B₇

(c)

vitamin B₉

(d)

vitamin B₅

10.

Glucose + aceticanhydrid \(\overset { pyridine }{ \longrightarrow } ?\)

(a)

di acetate

(b)

tetra acetate

(c)

penta acetate

(d)

hexa acetate

11.

Sugars that yield two to ten monosaccharide molecules on hydrolysis is

(a)

monosaccharides

(b)

disaccharides

(c)

oligosaccharides

(d)

polysaccharides

12.

Two amino acids say A, B react to give

(a)

two dipeptides

(b)

three dipeptides

(c)

four dipeptides

(d)

only one

13.

The cell potential E_cell is _______.

(a)

E^o_cell = E^o_cathode- E^o_anode

(b)

E^o_cell = E^o_anode - E^o_cathode

(c)

E_cell = E_cell- 0.0591 log K

(d)

E_cell = E_cell - \(\frac{0.0591}{n}\) log k

14.

Metals at the top of the electrochemical series are _______.

(a)

strong hydrating agents

(b)

strong dehydrating agents

(c)

strong reducing agents

(d)

strong oxidising agents

15.

Tollen's reagent is ________.

(a)

ammoniacal cuprous chloride

(b)

ammoniacal cuprous oxide

(c)

ammoniacal silver nitrate

(d)

ammoniacal silver chloride

16.

The cathode in Leclanche cell is ______.

(a)

Zinc container

(b)

Spongy lead

(c)

Graphite rod in contact with MnO₂

(d)

HgO mixed with graphite

17.

Unit of resistivity is ______.

(a)

ohm metre

(b)

siemen

(c)

sm^-1

(d)

mho

18.

Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

(a)

Clemmenson's reduction

(b)

Wolff krishner reduction

(c)

Rosenmmunds reduction

(d)

catalytic reduction

19.

The most acidic among the following is ________.

(a)

p- nitrophenol

(b)

p- hydroxybenzoicacid

(c)

o- hydroxy benzoic acid

(d)

p- toluic acid

20.

What is/are the factor(s) that govern the single electrode potential of a half cell?

(a)

concentration of ions in solution

(b)

tendency to form ions

(c)

temperature

(d)

all of these

21.

Partial reduction of acetic acid in the presence of LiAl H₄ results in the formation of ________.

(a)

ethane

(b)

ethanol

(c)

ethene

(d)

ethyne

22.

The potential of a single electrode is a half cell is called the ______.

(a)

Reduction potential

(b)

Half-wave potential single electrode potential

(c)

Single electrode potential

(d)

Cell potential

23.

According to Faraday's first law m = ZIt, where Z is ______.

(a)

reaction quotient

(b)

effective nuclear charge

(c)

atomic number

(d)

electrochemical equivalent

24.

Reduction of ketone gives _______.

(a)

Primary alcohol

(b)

Secondary alcohol

(c)

Primary amide

(d)

Secondary amide

25.

For the given cell Cr_(s)|Cr³⁺_(aq)||Cu²⁺_(aq)|Cu_(s) which is correct?

(a)

Cr is the anode

(b)

Cu is the anode

(c)

Overall cell reaction is 2Cr³⁺_(aq) +3Cu_(s) ⟶ 2Cr_(s) + 3Cu²⁺_(aq)

(d)

Cu is the anode and Overall cell reaction is 2Cr³⁺_(aq) +3Cu_(s) ⟶ 2Cr_(s) + 3Cu²⁺_(aq)

26.

A device in which spontaneous chemical reaction generates electric current ________.

(a)

Galvanic cell

(b)

Voltaic cell

(c)

Daniel cell

(d)

All the above

27.

The high boiling points of carboxylic acids is due to _______.

(a)

weak Vanderwaal's forces

(b)

intermolecular hydrogen bonding

(c)

intramolecular hydrogen bonding.

(d)

delocalisation of π electrons

28.

Acids have higher boiling points due to _______.

(a)

pleasant smell

(b)

waxy solid

(c)

hydrogen bonding

(d)

- COOH group

29.

Which of the following is least acidic.

(a)

C₂H₅OH

(b)

CH₃COOH

(c)

C₆H₅OH

(d)

ClCH₂COOH

30.

Aldehydes are functional isomers of _______.

(a)

ethers

(b)

alcohols

(c)

ketones

(d)

esters

31.

Chloretone is an addition product of _______.

(a)

CH₃CHO, HCHP

(b)

CH₃CHO, CHCl₃

(c)

\({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CCl }_{ 4 }\)

(d)

\(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)

32.

Which of the following does not give iodoform test?

(a)

aceto phenone

(b)

benzophenone

(c)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CHOH } \)

(d)

\({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -{ { CH }_{ 2 }{ CH }_{ 2 }-CH }_{ 3 }\)

33.

From which of the following, tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

(a)

HCHO

(b)

CH₃CHO

(c)

CH₃COCH₃

(d)

CO₂

34.

Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?

(a)

Ketones

(b)

Formaldehyde

(c)

Acetaldehyde

(d)

Both (a) and (b)

35.

An example of lyophilic colloid is________.

(a)

sulphur in water

(b)

phosphorus in water

(c)

starch

(d)

all of these

36.

A substance which destroys the activity of a catalyst is_______.

(a)

negative catalyst

(b)

catalytic poison

(c)

both (a) and (b)

(d)

promoter

37.

If ionic product < solubility product then the solution is ________.

(a)

saturated

(b)

super saturated

(c)

unsaturated

(d)

none of the above

38.

On heating, peroxides are ________.

(a)

stable

(b)

unstable

(c)

decomposes violently

(d)

both (b) and (c)

39.

When 10^-6 mole of a monobasic strong acid is dissolved in one litre of solvent, the pH of the solution is _______.

(a)

(b)

(c)

less than 6

(d)

more than 7

40.

Oxidation of glycerol with bismuth nitrate gives ________.

(a)

meso-oxalic acid

(b)

glyceric acid

(c)

tartronic acid

(d)

both (b) and (c)

41.

Phenol turns _______ when air oxidised.

(a)

red

(b)

violet

(c)

blue

(d)

green

42.

Which among the following is incorrect regarding acids?

(a)

It produces H⁺ ions in aqueous solution

(b)

It can donate a proton to another substance

(c)

It can accept a proton from another substance

(d)

It accepts a pair of electrons

43.

An example of trihydric alcohol is _________.

(a)

trimethyl carbinol

(b)

3-hexanol

(c)

propane-1,2,3-triol

(d)

tert-butylacohol

44.

The active component of dynamite is _______.

(a)

keiselghur

(b)

nitro glycerine

(c)

nitro benzene

(d)

trinitro toluene

45.

On oxidation of an alcohol gives an aldehyde having the same number of cabon atoms as that of alcohol is ________.

(a)

1⁰ alcohol

(b)

2⁰ alcohol

(c)

3⁰ alcohol

(d)

None

46.

Which among the following has the highest pH?

(a)

1M NH₄ OH

(b)

1M HCI

(c)

1M NaOH

(d)

0.1 M NaOH

47.

Picric acid is _______.

(a)

2,4,6 trinitro toluene

(b)

2,4,6 trinitro benzaldehyde

(c)

2,4,6 trinitro phenol

(d)

2,4,6 trinitro benzoic acid

48.

Pick the strongest conjugate base among the following

(a)

Cl^-

(b)

\({ NO }_{ 2 }^{ - }\)

(c)

\({ SO }_{ 4 }^{ 2- }\)

(d)

CH₃COO^-

49.

CH₃CH₂OH \(\underset { (O) }{ \longrightarrow } \) CH₃CHO \(\underset { (O) }{ \longrightarrow } \) CH₃COOH To stop the oxidation reaction at the aldehyde stage, ______ is used as an oxidising agent.

(a)

KMnO₄ | H⁺

(b)

K₂Cr₂O₇ | H⁺

(c)

pyridinium chloro chromate

(d)

both (a) and (b)

50.

The common name of this compound CH₂ = CH-CH-OH is ______.

(a)

glycerol

(b)

vinyl alcohol

(c)

allyl alcohol

(d)

prop-2-en-l-ol

51.

The compound that acts as a solvent for Grignard reagent is ______.

(a)

Ethyl alcohol

(b)

Diethyl ether

(c)

Acetone

(d)

Benzene

52.

Compound of molecular formula C₇H₈O is a sweet smeeling liquid. A on reaction with acidified K₂Cr₂O₇ gives compound B of molecular formula C₇H₈O. B reduces Tollen's reagent A and B are respectively.

(a)

benzaldelyde and benzoic acid

(b)

Methyl phenykarbinol and acetophenone

(c)

benzyl alcohol and benzaldehyde

(d)

diphenyl carbinol and benzophenone

53.

Lucas test is used to distinguish 1⁰, 2⁰ and 3⁰ ______.

(a)

amines

(b)

nitro compound

(c)

alcohols

(d)

all the above

54.

Predict the structure of propane-1,2 diol ______.

(a)

CH₂ (OH) - CH₂CH₂OH

(b)

HOCH₂ - CH₂OH

(c)

CH₃CH (OH) CH₂OH

(d)

None of these

55.

A colloidal system in which the dispersed phase has very little affinity for the dispersion medium is called _______.

(a)

lyophilic

(b)

lyophobic

(c)

solid

(d)

aerosol

56.

Ethyl alcohol cannot be used as a solvent for CH₃MgI because ______.

(a)

CH₃MgI reacts with alcohol giving methane

(b)

the reaction between them is explosive in natrue

(c)

CH₃MgI is converted to C₂H₅MgI

(d)

alcohol is immiscible with CH₃MgI

57.

Colloidal solution of ink is prepared by _______.

(a)

mechanical dispersion

(b)

electro dispersion

(c)

ultrasonic dispersion

(d)

peptisation

58.

Which among the following reagent is not used to differentiate ethanol and phenol?

(a)

neutral FeCl₃

(b)

C₆H₅N₂CI

(c)

NaOH

(d)

anhy ZnCl₂

59.

Auto catalysis is observed in the reaction given below.
CH₃COOC₂H₅+H₂O➝ CH₃COOH+C₂H₅OH

(a)

CH₃COOC₂H₅

(b)

H₂O

(c)

CH₃COOH

(d)

C₂H₅OH

60.

Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.

(a)

only (ii)

(b)

(ii) and (iii)

(c)

only (i)

(d)

(i) and (iv)

61.

For a reaction, E_a = 0 and k = 4.2 x 10⁵ sec^-1at 300 K, the value of kat 310 K will be _______.

(a)

4.2 x 10⁵ sec^-1

(b)

8.4 x 10⁵ sec^-1

(c)

8.4 x 10⁵ sec^-1

(d)

unpredictable

62.

CH₃COOCH₃ + H₂ OH \(\overset { { H }^{ + } }{ \longrightarrow } \) CH₃ COOH + CH₃ OH is an example of _______ order reaction.

(a)

first

(b)

zero

(c)

third

(d)

pseudo

63.

Pick out the odd one.

(a)

₉₂U²³⁸ ⟶ ₉₀Th²³⁴ + ₂He⁴

(b)

SO₂ Cl₂ ⟶ SO₂ + Cl₂

(c)

CH₃ COOCH₃ + H₂O \(\overset { { H }^{ + } }{ \longrightarrow } \) CH₃ COOH + CH₃ OH

(d)

C₁₂ H₂₂ O₁₁ + H₂O \(\overset { { H }^{ + } }{ \longrightarrow } \) C₆ H₁₂ O₆ + C₆ H₁₂ O₆

64.

The addition of a catalyst during a chemical reaction alters which of the following quantities?

(a)

Activation energy

(b)

Entropy

(c)

Internal energy

(d)

Enthalpy

65.

Which of the following does not affect the rate of reaction?

(a)

Amount of the reactant taken

(b)

Physical state of the reactant

(c)

∆H of reaction

(d)

Size of vessel

66.

Helium is used in balloons in the place of hydrogen because it is________.

(a)

incombustible

(b)

radioactive and detected easily

(c)

lighter than hydrogen

(d)

both (a) and (c)

67.

Which one of the following orders is not in accordance with the property stated against it?

(a)

F₂> CI₂> Br₂> I₂: Bond dissociation energy

(b)

HI > HBr > HCI > HF: Acidic property in water

(c)

F₂> Cl₂> Br₂> l₂: Oxidising power

(d)

F₂> Cl₂> Br₂> l₂: Electronegativity

68.

Which is dibasic?

(a)

Orthophosphoric acid

(b)

Pyrophosphoric acid

(c)

Orthophosphorus acid

(d)

Hypophosphorous acid

69.

The Bragg's equation is _______.

(a)

λ = 2d sinθ

(b)

nd = 2λ sinθ

(c)

2λ = nd sinθ

(d)

nλ = 2d sinθ

70.

The total number of elements of symmetry in a cubic crystal is________.

(a)

(b)

(c)

(d)

71.

The defect arising due to an ion occupying interstitial position is called _______.

(a)

Schottky defect

(b)

Metal excess defect

(c)

Frenkel defect

(d)

Metal deficiency defect

72.

Calculate the number of atoms in a cubic unit cell having one atom on each corner and one atom on each body diagonal _______.

(a)

(b)

(c)

(d)

73.

A solid with formula ABC₃ would probably have, _______.

(a)

A at body centre, B at face centres and C at corners of the cube

(b)

A at corners of cube, B at body centre, C at face centre

(c)

A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell

(d)

A at corner, B at face centre, C at body centre

74.

All elements except carbon have the tendency to show maximum covalency of six ______

(a)

due to presence of vacant d-orbitals

(b)

due to absence of vacant d-orbitals

(c)

due to presence of partially filled d-orbitals

(d)

due to presence of completely filled d-orbitals

75.

In graphite electrons are _______.

(a)

localised on each C-atom

(b)

localised on every third C-atom

(c)

delocalised within the layer

(d)

present in anti-bonding orbital

76.

If the standard electrode potential (E^o) of a metal is ________ and __________ the metal is a powerful reducing agent.

(a)

large, negative

(b)

large, positive

(c)

small, negative

(d)

small, positive

77.

On oxidation with KMnO₄ in acidic medium, SO₂ is oxidised to _______.

(a)

SO₂

(b)

H₂SO₄

(c)

SO₃^2-

(d)

H₂S

78.

Which of the following is not coloured?

(a)

Mn²⁺

(b)

Zn²⁺

(c)

Cr³⁺

(d)

Cu²⁺

79.

Oxygen stabilises higher oxidation state because_______.

(a)

it is electronegative

(b)

of its tendency to form multiple bond

(c)

of large size

(d)

of small size

80.

Galena is_______.

(a)

PbS

(b)

ZnS

(c)

Ag₂S

(d)

FeS₂

81.

Malachite has______ composition.

(a)

2CuCO₃.Cu(OH)₂

(b)

CuCO₃.Cu(OH)₂

(c)

Cu₂O

(d)

Cu₂S

82.

\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.

(a)

Roasting

(b)

Calcination

(c)

Smelting

(d)

Leaching

83.

In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

(a)

Non-wettability of the mineral particles in froth.

(b)

Non-wettability of the mineral particles in water

(c)

Non-wettability of the gangue particles in froth

(d)

Non-wettability of the gangue particles in water

84.

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

(a)

Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)

(b)

Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

(c)

Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)

(d)

Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

85.

Magnetic moment is given by the formula _______.

(a)

\(\sqrt { n(n+1) } \)

(b)

\(\sqrt { n(n+2) } \)

(c)

\(\sqrt { (n+2) } \)

(d)

\(\sqrt { { n }^{ 2 }+(n+2) } \)

86.

The ambidentate ligands are ________.

(a)

SCN^-and NCS

(b)

NO₂^- and ONO

(c)

both (a) and (b)

(d)

None

87.

The coordination polyhedron of the complex [Cr(H₂O)₆]CI₃ is________.

(a)

square planar

(b)

tetrahedral

(c)

trigonal

(d)

octahedral

88.

The type of isomerism found in the complexes [Co(NO₂)(NH₃)₅]SO₄and [Co(SO₄)(NH₃)₅] NO₂ _______.

(a)

Hydrate isomerism

(b)

Coordination isomerism

(c)

Linkage isomerism

(d)

Ionisation

89.

The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as _______.

(a)

[Co(NH₃)₃(H₂O)₂Cl]Cl₂

(b)

[Co(NH)₃(H₂O)Cl₃]

(c)

[Co(NH₂)₃(H₂O)₂Cl]

(d)

[Co(NH₃)₃(H₂O)₃]Cl₃

90.

Which of the following octahedral complexes do not show geometrical isomerism?

(a)

[Co(NH₃)₃Cl₃]

(b)

[PtCl₂(NH₃)₄]

(c)

[Pt(NH₃)₂Cl₂]

(d)

[Co(en)₃]³⁺

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

90 x 1 = 90

(a)
p-benzoquinone

(a)
chain growth

(b)
(CH₃)₂C = 0

(a)
vitamin B₆

10.

11.

12.

(d)
only one

13.

(d)
E_cell = E_cell - \(\frac{0.0591}{n}\) log k

14.

(d)
strong oxidising agents

15.

16.

(b)
Spongy lead

17.

(a)
ohm metre

18.

(a)
Clemmenson's reduction

19.

20.

(d)
all of these

21.

(b)
ethanol

22.

23.

(d)
electrochemical equivalent

24.

(b)
Secondary alcohol

25.

(a)
Cr is the anode

26.

(d)
All the above

27.

(b)
intermolecular hydrogen bonding

28.

29.

(a)
C₂H₅OH

30.

31.

(d)
\(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)

32.

(b)
benzophenone

33.

34.

(d)
Both (a) and (b)

35.

36.

(b)
catalytic poison

37.

38.

(d)
both (b) and (c)

39.

(a)
6

40.

(a)
meso-oxalic acid

41.

(a)
red

42.

43.

44.

(b)
nitro glycerine

45.

(a)
1⁰ alcohol

46.

47.

48.

(d)
CH₃COO^-

49.

50.

51.

(b)
Diethyl ether

52.

53.

54.

55.

(b)
lyophobic

56.

(a)
CH₃MgI reacts with alcohol giving methane

57.

(a)
mechanical dispersion

58.

(d)
anhy ZnCl₂

59.

60.

(d)
(i) and (iv)

61.

(a)
4.2 x 10⁵ sec^-1

62.

(d)
pseudo

63.

64.

(a)
Activation energy

65.

66.

(d)
both (a) and (c)

67.

(a)
F₂> CI₂> Br₂> I₂: Bond dissociation energy

68.

69.

(d)
nλ = 2d sinθ

70.

(b)
23

71.

72.

(d)
5

73.

(b)
A at corners of cube, B at body centre, C at face centre

74.

(a)
due to presence of vacant d-orbitals

75.

76.

(a)
large, negative

77.

(b)
H₂SO₄

78.

(b)
Zn²⁺

79.

(b)
of its tendency to form multiple bond

80.

(a)
PbS

81.

(b)
CuCO₃.Cu(OH)₂

82.

(a)
Roasting

83.

(b)
Non-wettability of the mineral particles in water

84.

(b)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

85.

(b)
\(\sqrt { n(n+2) } \)

86.

87.

(d)
octahedral

88.

(d)
Ionisation

89.

(a)
[Co(NH₃)₃(H₂O)₂Cl]Cl₂

90.

(d)
[Co(en)₃]³⁺

12th Standard Chemistry English Medium Important 1 Mark Creative Questions (New Syllabus) 2020

QB365 Student Learing Managemnet System

Std: 12th Standard - Chemistry

chapter: - Model Question paper

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

NEW MCQ Practice Test - Tamilnadu Stateboard Class 12

Chemistry Tamilnadu Stateboard Class 12 MCQ Practice Test

Tamilnadu Stateboard Class 12 MCQ Practice Test

12th Standard Study Materials