12 Standard Chemistry English Medium All Chapter Book Back and Creative One Mark Question 2020

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Questions:

Multiple Choice Question

59 x 1 = 59

Use of chloropicrin is as ____________

(a)

explosive

(b)

dye

(c)

anaesthetic

(d)

sterilizing agent

Which of the following will not undergo Hoffman's bromamide reaction?

(a)

Ethanamide

(b)

Propanamide

(c)

Methanamide

(d)

Phenyl methanamide

Phenacetin is _______

(a)

antipyretic

(b)

analgesic

(c)

antibiotic

(d)

antiseptic

Sucrose esters are used as _________

(a)

emulsifiers

(b)

preservatives

(c)

food colours

(d)

antioxidants

Hereditary traits are carried by__________

(a)

nucleic acid

(b)

protein

(c)

lipid

(d)

carbohydrate

A mixture of D (+) glucose and D (-) fructose is known as__________.

(a)

cane sugar

(b)

sweetless sugar

(c)

invert sugar

(d)

starch sugar

In the cell representation (+) represents ______.

(a)

salt bridge

(b)

phase boundary

(c)

cathode

(d)

anode

Which among the following has same equivalent and molar conductance?

(a)

H₂SO₄

(b)

CH₃COOH

(c)

NaCI

(d)

Na₂SO₄

Oxidation of secondary alcohol gives _______.

(a)

aldehydes

(b)

ketones

(c)

ethers

(d)

primary alcohols

10.

Isopropyl alcohol vapours with air over silver catalyst at 520 K give _______.

(a)

tertbutyl alcohol

(b)

acetaldehyde

(c)

acetone

(d)

2-propanol

11.

An example of Gel is_______.

(a)

sharing cream

(b)

paints

(c)

butter

(d)

whippedcream

12.

The degree of hydrolysis of 0.1 M solution of ammonium acetate is 8.48 x 10^-5. The dissociation constant of the weak base is _______.

(a)

1.39 x 10^-4

(b)

1.39 x 10^-5

(c)

1.45 x 10^-10

(d)

1.45 x 10^-9

13.

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

14.

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)

15.

p-Nitrophenol is having lower pK_a value than phenol because ______.

(a)

phenol is more acidic than p-nitro phenol

(b)

anion of p-nitro phenol is more stabilised by resonance than that of phenol.

(c)

degree of ionisation of p-nitro phenol is less than that of phenol

(d)

anion of p-nitro phenol is less stable than that of phenol.

16.

The phenomenon of scattering of light by the sol particles is called _______.

(a)

tyndall effect

(b)

electrophoresis

(c)

cataphoresis

(d)

dialysis

17.

The polymer used in making blankets (artificial wool) is _______.

(a)

polystyrene

(b)

PAN

(c)

polyester

(d)

polythene

18.

Which of the following statement is correct?

(a)

Ovalbumin is a simple food reserve in egg-white

(b)

Blood proteins thrombin and fibrinogen are involved in blood clotting

(c)

Denaturation makes protein more active

(d)

Insulin maintains the sugar level of in the human body

19.

Complete hydrolysis of cellulose gives ______.

(a)

L-Glucose

(b)

D-Fructose

(c)

D-Ribose

(d)

D-Glucose

20.

Which of the following amines does not undergo acetylation?

(a)

t – butylamine

(b)

ethylamine

(c)

diethylamine

(d)

triethylamine

21.

_______.

(a)

H₃PO₂ and H₂O

(b)

H⁺/H₂O

(c)

HgSO₄/H₂SO₄

(d)

Cu₂Cl₂

22.

The reagent used to distinguish between acetaldehyde and benzaldehyde is _______.

(a)

Tollens reagent

(b)

Fehling’s solution

(c)

2,4 – dinitrophenyl hydrazine

(d)

semicarbazide

23.

Ethanoic acid \(\overset { P/{ Br }_{ 2 } }{ \longrightarrow } \) 2-bromoethanoic acid. This reaction is called _______.

(a)

Finkelstein reaction

(b)

Haloform reaction

(c)

Hell – Volhard – Zelinsky reaction

(d)

none of these

24.

On reacting with neutral ferric chloride, phenol gives ______.

(a)

red colour

(b)

violet colour

(c)

dark green colour

(d)

no colouration.

25.

Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

(a)

benzaldehyde

(b)

propanoic acid

(c)

methyl propanoate

(d)

acetaldehyde

26.

The most effective electrolyte for the coagulation of As₂S₃Sol is _______.

(a)

NaCl

(b)

Ba(NO₃)₂

(c)

K₃[Fe(CN)₆]

(d)

Al₂(SO₄)₃

27.

Fog is colloidal solution of _______.

(a)

solid in gas

(b)

gas in gas

(c)

liquid in gas

(d)

gas in liquid

28.

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because _______.

(a)

Zinc is lighter than iron

(b)

Zinc has lower melting point than iron

(c)

Zinc has lower negative electrode potential than iron

(d)

Zinc has higher negative electrode potential than iron

29.

The button cell used is watches function as follows
Zn (s) + Ag₂O (s) + H₂O (l) ⇌ 2Ag (s) + Zn²⁺ (aq) + 2OH^-(aq) the half cell potentials are Ag₂O (s) + H₂O (l) + 2e^- → 2Ag (s) + 2OH^- (aq) E^o= 34V and Zn (s) → Zn²⁺ (aq) + 2e⁻ E⁰ = 0.76V . The cell potential will be_______.

(a)

0.84V

(b)

1.34V

(c)

1.10V

(d)

0.42V

30.

Which of the following can act as Lowery – Bronsted acid well as base?

(a)

HCl

(b)

SO₄²⁻

(c)

HPO₄²⁻

(d)

Br^-

31.

Using Gibb’s free energy change, ∆G^o=57.34 kJ mol^-1, for the reaction, X₂Y_(s)⇌2X⁺+Y^2-(aq), calculate the solubility product of X₂Y in water at 300 K_______. (R = 8.3 J K^-1Mol^-1)

(a)

10^-10

(b)

10^-12

(c)

10^-14

(d)

can not be calculated from the given dat

32.

For the second order reaction \({ t }_{ \frac { 1 }{ 2 } }\alpha \) _____.

(a)

\(\frac { 1 }{ { a }^{ 2 } } \)

(b)

\(\frac { 1 }{ { a } } \)

(c)

Constant

(d)

33.

Concentration is expressed in?

(a)

\(\frac { number\ of\ moles/litre }{ time\ in\ sec } \)

(b)

\(\frac { time\ in\ sec }{ number\ of\ moles/litre } \)

(c)

\(\frac { number\ of\ moles/litre }{ volume } \)

(d)

\(\frac { volume }{ number\ of\ moles/litre } \)

34.

Which reaction is not feasible.

(a)

\({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)

(b)

\(2 \mathrm{KBr}+\mathrm{I}_{2} \longrightarrow 2 \mathrm{KI}+\mathrm{Br}_{2}\)

(c)

\(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)

(d)

\(2 \mathrm{KI}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{KBr}+\mathrm{I}_{2}\)

35.

Catenation property of group 15 elements, follow the order _______.

(a)

N < P < As < Sb < Bi

(b)

P >> N > As > Sb > Bi

(c)

P < N < As < Sb < Bi

(d)

N>> P > As > Sb > Bi

36.

The site labelled as 'X' in FCC arrangement is_______.

(a)

Face with 1/4 contribution

(b)

Edge with 1/4 contribution

(c)

Corner with 1/4 contribution

(d)

Tetrahedral void with 1/8 contribution

37.

In the Bragg's equation for diffraction of X-rays, 'n' represents _______.

(a)

The number of moles

(b)

Avogadro number

(c)

A quantum number

(d)

Order of reflection

38.

Borax is _______.

(a)

Na₂[B₄O₅(OH)₄).8H₂O

(b)

Na₂[B₄O₅(OH)₆).7H₂O

(c)

Na₂[B₄O₃(OH)₈].6H₂O

(d)

Na₂[B₄O₂(OH)₁₀).5H₂O

39.

Which one of the following compounds has similar structure to that of graphite?

(a)

Boron nitride

(b)

Boron Carbide

(c)

Aluminium Carbide

(d)

Aluminium Oxide

40.

Sometimes vessels made of copper or bronze show traces of green colour. This is due to the formation of _________.

(a)

Cu(OH)₂

(b)

CuCO₃

(c)

Cu(OH)₂CuCO₃

(d)

Cu(OH)₂CuSO₄

41.

The reaction of aqueous KMnO₄ with H₂O₂ in acidic condition gives_______.

(a)

Mn⁴⁺ and MnO₂

(b)

Mn⁴⁺ and O₂

(c)

Mn²⁺ and O₂

(d)

Mn²⁺ and O₃

42.

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

(a)

magnetic properties

(b)

chemical properties

(c)

physical properties

(d)

melting point

43.

Malachite has______ composition.

(a)

2CuCO₃.Cu(OH)₂

(b)

CuCO₃.Cu(OH)₂

(c)

Cu₂O

(d)

Cu₂S

44.

According to IUPAC, No is _________.

(a)

nitro

(b)

nitrosyl

(c)

nitrate

(d)

nitrito

45.

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

46.

The rate constant of a reaction is 5.8 x 10^-2 S^-1 The order of the reaction is ______.

(a)

First order

(b)

zero order

(c)

Second order

(d)

Third order

47.

For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is

(a)

(2.5 x 2) hours

(b)

\(\left( \frac { 2.5 }{ 2 } \right) \) hours

(c)

2.5 hours

(d)

Without knowing the rate constant, t_1/2 cannot be determined from the given data

48.

In calcium fluoride, having the fluorite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.

(a)

4 and 2

(b)

6 and 6

(c)

8 and 4

(d)

4 and 8

49.

Graphite and diamond are ________.

(a)

Covalent and molecular crystals

(b)

ionic and covalent crystals

(c)

both covalent crystals

(d)

both molecular crystals

50.

Choose the correct statement.

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)₄]^2- is BM and it has square planar structure.

(c)

Crystal field splitting energy \(\left( { \Delta }_{ 0 } \right) \) [FeF₆]^4- is higher than the \((\Delta _{ 0 })\) of [Fe(CN)₆]^4-

(d)

crystal field stabilization energy of [V(H₂O)₆]²⁺ is higher than the crystal field stabilization of [Ti(H₂O)₆]²⁺

51.

A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

(a)

[M(H₂O)₄Cl]SO₄.2H₂O

(b)

[M(H₂O)₆]SO₄

(c)

[M(H₂O)₅Cl]SO₄.H₂O

(d)

[M(H₂O)₃Cl]SO₄.3H₂O

52.

MnO₄^- react with Br^- in alkaline P^H to give ________.

(a)

BrO₃^- MnO₂

(b)

Br₂, MnO₄^2-

(c)

Br₂, MnO₂

(d)

BrO^-, MnO₄^2-

53.

Which of the following does not give oxygen on heating?

(a)

K₂Cr₂O₇

(b)

(NH₄)₂Cr₂O₇

(c)

KClO₃

(d)

Zn(ClO₃)₂

54.

The stability of +1 oxidation state increases in the sequence ________.

(a)

Al < Ga < In < Tl

(b)

Tl < In < Ga < Al

(c)

In < Tl < Ga < Al

(d)

Ga< In < Al < Tl

55.

Which of the following is strongest acid among all?

(a)

(b)

(c)

HBr

(d)

HCl

56.

In the brown ring test, brown colour of the ring is due to _______.

(a)

a mixture of No and NO₂

(b)

Nitroso ferrous sulphate

(c)

Ferrous nitrate

(d)

Ferric nitrate

57.

The element that does not show catenation among the following p-block elements is ________.

(a)

Carbon

(b)

silicon

(c)

Lead

(d)

germanium

58.

In the Ellingham diagram, for the formation of carbon monoxide________.

(a)

\(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \) is negative

(b)

\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive

(c)

\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

(d)

initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700^oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

59.

Which one of the following reaction represents calcinations?

(a)

\(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)

(b)

\(2ZnS+3O_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)

(c)

\(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)

(d)

Both (a) and (c)

Assertion and reason

1 x 2 = 2

60.

Assertion: 2-methyl-1,3-butadiene is the monomer of natural rubber
Reason: Natural rubber is formed through anionic addition polymerisation.
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.

(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

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Answers Key:

Multiple Choice Question

59 x 1 = 59

(d)
sterilizing agent

(a)
Ethanamide

(a)
antipyretic

(a)
emulsifiers

(a)
nucleic acid

(b)
phase boundary

(b)
ketones

10.

11.

12.

(b)
1.39 x 10^-5

13.

(a)
6

14.

15.

(b)
anion of p-nitro phenol is more stabilised by resonance than that of phenol.

16.

(a)
tyndall effect

17.

(b)
PAN

18.

19.

(d)
D-Glucose

20.

(d)
triethylamine

21.

(a)
H₃PO₂ and H₂O

22.

(b)
Fehling’s solution

23.

24.

(b)
violet colour

25.

26.

As₂S₃ is a negatively charged colloid. It will be most effectively coagulated by the cation with greater valency. i.e., Al³⁺.

27.

dispersion medium-gas
dispersed phase-liquid

28.

E^o_Zn²⁺[Zn]= 0.76V and E^o_Fe²⁺[Fe]= -0.44V
Zinc has higher negative electrode potential than iron, iron cannot be coated on zinc

29.

Anodic Oxidation: (Reverse the given reaction)
(E^o_ox) = 0.76 V Cathodic reduction
E^o_cell= (E^o_ox)+ (E^o_red)
= 0.76 + 0.34 = 1.1 V

30.

HPO₄²⁻ can have the ability to accept a proton to form H₂PO₄^-
It can also have the ability to donate a proton to form PO₄^-3

31.

(a)
10^-10

32.

(b)
\(\frac { 1 }{ { a } } \)

33.

(a)
\(\frac { number\ of\ moles/litre }{ time\ in\ sec } \)

34.

(b)
\(2 \mathrm{KBr}+\mathrm{I}_{2} \longrightarrow 2 \mathrm{KI}+\mathrm{Br}_{2}\)

35.

(b)
P >> N > As > Sb > Bi

36.

37.

(d)
Order of reflection

38.

(a)
Na₂[B₄O₅(OH)₄).8H₂O

39.

(a)
Boron nitride

40.

41.

42.

(a)
magnetic properties

43.

(b)
CuCO₃.Cu(OH)₂

44.

(b)
nitrosyl

45.

(a)
[Co(NH₃)₃(H₂O)₂Cl]Cl₂

46.

(a)
First order

47.

For a first order reaction
t_1/2 = \(\frac { 0.693 }{ { k }}\)
t_1/2 does not depend on the initial concentration and it remains constant (whatever may be the initial concentration)
t_1/2 = 2.5 hrs

48.

49.

50.

(d)
crystal field stabilization energy of [V(H₂O)₆]²⁺ is higher than the crystal field stabilization of [Ti(H₂O)₆]²⁺

51.

Molecular formula: MSO₄Cl.6H₂O
Formation of white precipitate with Barium chloride indicates that SO^2-₄ ions are outside the coordination sphere, and no precipitate with AgNO₃ solution indicates that the Cl^- ions are inside the coordination sphere. Since the coordination number of M is 6.Cl^- and 5 H₂O are ligands, remaining 1 H₂O molecular and SO^2-₄ are in the outer coordination sphere.