Question Set B

12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020

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Questions:

Multiple Choice Question

63 x 1 = 63

_______ is used mainly as preservative for the preparation of pickles.

(a)

Sodium meta bisulphite

(b)

Potassiummaeta bisulphite

(c)

Benzoic acid

(d)

Acetic acid

The class of drugs used for the treatment of stress is _______

(a)

antihistamine

(b)

tranquilizens

(c)

antimicrobials

(d)

aminoglycosides

The helical structure of protein is stabilised by_________

(a)

peptide bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

Vanderwaals inter action

The properties of protein are determined by___________

(a)

nature of the amino acids

(b)

the position of NH₂ group

(c)

the position of COOH group

(d)

all

Pyridoxine is__________

(a)

vitamin B₆

(b)

vitamin B₇

(c)

vitamin B₉

(d)

vitamin B₅

On hydrolysis, which one of the following disaccharide will give a ketose and an aldose?

(a)

Maltose

(b)

Sucrose

(c)

Lactose

(d)

All the above

Glucose reacts with acetic anhydride in the presence of pyridine to give

(a)

monoacetate

(b)

diacetate

(c)

penta acetate

(d)

no reaction

Low molar conductivity at high concentration is due to _______.

(a)

High attractive force between oppositely charged ions

(b)

Viscous drag due to greater solvation

(c)

Both High attractive force between oppositely charged ions and Viscous drag due to greater solvation

(d)

Neither High attractive force between oppositely charged ions and Viscous drag due to greater solvation

Aldol is _________.

(a)

2-hydroxy butanol

(b)

3 -hydroxy butanol

(c)

3- hydroxy butanal

(d)

2 -hydroxy butanal

10.

The quantity of charge required to obtain 1 mole of aluminum from Al₂O₃ is ______.

(a)

(b)

(c)

(d)

12F

11.

Debye, Huckel and Onsager equation for strong electrolytes is λ_c = λ_∞ (A + Bλ_∞) \(\sqrt C\). The slope value is ______.

(a)

λ_∞

(b)

(A + Bλ_∞)

(c)

(d)

\(\sqrt C\)

12.

Which among the following is the strongest reducing agent?

(a)

F₂

(b)

Cl₂

(c)

(d)

13.

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

14.

Methyl ketones are usually characterised by _______.

(a)

the Fehling's solution

(b)

the iodoform test

(c)

the Schiff's test

(d)

the Tollen's reagent

15.

The colloid used for stomach disorder is_______.

(a)

colloidal silver

(b)

colloidal antimony

(c)

colloidal gold

(d)

milk of magnesia

16.

An example of Gel is_______.

(a)

sharing cream

(b)

paints

(c)

butter

(d)

whippedcream

17.

The oxidation of sodium sulphite by air is retarded by _______.

(a)

MnO₂

(b)

H₂S

(c)

Alcohol

(d)

AS₂O₃

18.

A drop of hydrochloric acid is added to pure water, its pH _____.

(a)

increases

(b)

decreases

(c)

increases and then decreases

(d)

resist the change in pH and so remains unaltered

19.

On heating, peroxides are ________.

(a)

stable

(b)

unstable

(c)

decomposes violently

(d)

both (b) and (c)

20.

The number of possible isomers for molecular formula C₃H₈O is _______.

(a)

(b)

(c)

(d)

21.

Metamerism is exhibited by _______.

(a)

hydrocarbon

(b)

nitro compounds

(c)

mineral acid

(d)

ether

22.

According to Lewis concept of acids and bases, ethers are _______.

(a)

neutral

(b)

acidic

(c)

basic

(d)

amphoteric

23.

Oxidation of glycerol with bismuth nitrate gives ________.

(a)

meso-oxalic acid

(b)

glyceric acid

(c)

tartronic acid

(d)

both (b) and (c)

24.

When sodium acetate is added to acetic acid, the degree of ionisation of acetic acid _______.

(a)

increases

(b)

decreases

(c)

dose not change

(d)

becomes zero

25.

The ultimate product obtained when glycerol reacts with oxalic acid at 533K is ________.

(a)

formic acid

(b)

glycerol oxalate

(c)

allyl alcohol

(d)

acrolein

26.

The alcohol obtained by the hydrolysis of oils and fats is _______.

(a)

pentanol

(b)

propanol

(c)

glycerol

(d)

glycol

27.

The boiling point of ethyl alcohol should be less than that of _______.

(a)

propane

(b)

formic acid

(c)

dimethyl ether

(d)

none of the above

28.

Ionic product of water increases when _______.

(a)

Pressure decreases

(b)

H⁺ ions are added

(c)

OH^-ions are added

(d)

temperature increases

29.

Analyses the equilibrium
HClO₄ +H₂O ⇌ H₃O+ \({ ClO }_{ 4 }^{ - }\)
and choose the correct statement.

(a)

H₃O⁺ is the conjugate base of H₂O

(b)

CIO₄^- is the conjugate base of HCIO₄

(c)

H₂O is the conjugate acid of H₃O⁺

(d)

HCIO₄ is the conjugate acid of H₃O⁺

30.

Glycerol when heated with cone. H₂SO₄ gives ______.

(a)

allyl alcohol

(b)

propyl alcohol

(c)

acrolein

(d)

propylene

31.

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

(a)

CH₂ (OH) - CH₂CH₂OH

(b)

HOCH₂ - CH₂OH

(c)

CH₃CH (OH) CH₂OH

(d)

None of these

32.

For W/O emulsion, the principle emulsifying agent is _______.

(a)

proteins

(b)

synthetic soaps

(c)

lampblack

(d)

gums

33.

The multilayer adsorption of gases on solids take place in _______.

(a)

physical adsorption

(b)

chemisorption

(c)

sols

(d)

active centres

34.

Which is optically active?

(a)

n-butyl alcohol

(b)

isobutyl alcohol

(c)

2-butanol

(d)

t-butyl alcohol

35.

Which among the following does not affect adsorption?

(a)

surface area of the adsorbent

(b)

catalyst

(c)

temperature

(d)

pressure

36.

In a second order reaction, if one of the concentration is excess, the order of the reaction is ________ order reaction.

(a)

first

(b)

pseudo first

(c)

third

(d)

zero

37.

The oxidation of potassium iodide by potassium persulphate as per the rate law, rate k[K₂S₂O₈] [K1]. The order with respect to potassium iodide is, _______.

(a)

two

(b)

one

(c)

three

(d)

four

38.

The value of rate constant of a pseudo first order reaction______.

(a)

Independent on the concentration of reactants present in small amount

(b)

Depends on the concentration of reactants present in excess

(c)

Independent of the concentration of reactants

(d)

Depends only on temperature.

39.

The unit of zero order rate constant is _____.

(a)

litre mol^-1 sec^-1

(b)

mol litre^-1 sec^-1

(c)

sec^-1

(d)

litre² sec^-1

40.

What will be the rate constant of a order reaction if its half life is given to be 20 min?

(a)

13.86 min^-1

(b)

28.86 min^-1

(c)

3.47 x 10^-2 min^-1

(d)

None of these

41.

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

42.

A+B \(\longrightarrow \) C; ∆H = 60 kJ mol^-1 Ea_f = 150 kJ. What is the activation energy of the backward reaction?

(a)

210 kJ

(b)

105 kJ

(c)

90 kJ

(d)

145 kJ

43.

What would be the rate of disappearance of oxygen, if the rate of formation of nitric oxide (NO) is 3.6 x 10^-3mol L^-1 s^-1?

(a)

4 x 10^-3mol L^-1s^-1

(b)

4 x 10^-3mol^-1 L^-1s^-1

(c)

4.5 x 10^-3mol L^-1s^-1

(d)

4.5 x 10^-3mol^-1 L^-1s^-1

44.

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

45.

Which of the following halides of group 15 is not hydrolysed?

(a)

NF₃

(b)

PF₃

(c)

NI₃

(d)

Both (a) and (b)

46.

If electrical conductivity is found to be same in all directions through a solid the substance is ________ solid and the property is called _________.

(a)

crystalline, isotropy

(b)

amorphous, isotropy

(c)

crystalline, anisotropy

(d)

amorphous, isotropy

47.

The number of chloride ions that surrounds the central Na ion in NaCl crystal is_______.

(a)

(b)

(c)

(d)

48.

The coordination number of Zn in ZnO and Zn in ZnS are respectively________.

(a)

4 and 6

(b)

4 and 4

(c)

2 and 4

(d)

4 and 3

49.

An excess of potassium ion makes KCl crystals appear violet since _______.

(a)

Some of anionic sites are occupied by unpaired electron

(b)

Anionic sites are occupied by pair of electrons

(c)

both (a) and (b)

(d)

neither (a) nor (b)

50.

An element with atomic mass 60 having fee structure has a density of 6.23g/cm³. What is the edge length of unit cell?

(a)

200 Pm

(b)

300 Pm

(c)

400 Pm

(d)

500 Pm

51.

If 'a' is the length of unit cell, then which one is correct relationship?

(a)

For simple cubic lattice, radius of metal atom =\(\frac{a}{2}\)

(b)

For bee lattice, radius of metal atom \(=\frac { \sqrt { 3a } }{ 4 } \)

(c)

For fcc lattice, radius of metal atom \(=\frac { a }{ 2\sqrt { 2 } } \)

(d)

All of these

52.

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

53.

On moving down the group 13, density ______

(a)

decreases

(b)

increases

(c)

First decreases then increases

(d)

remains same

54.

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

55.

The general electronic configuration of d-block elements can be written as ________.

(a)

[Noble gas]n - 1d^1-10ns^1-2

(b)

[Noble gas]n - 1d^-10 n^1-6

(c)

[Noble gas]n - 2 d¹⁰ns^1-2

(d)

[Noble gas]n - 2 d¹⁰ns^1-6

56.

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.

(a)

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

(b)

Ce⁴⁺ and Yb²⁺acquire f⁰ configuration

(c)

Ce⁴⁺ and Yb²⁺acquire f⁷and f¹⁴ configuration

(d)

Ce⁴⁺and Yb²⁺acquire f⁰ and f¹⁴ configuration

57.

Which of the following is wrong with respect to lanthanide contraction?

(a)

Decrease in ionic radii

(b)

Increase in tendency to act as reducing agents

(c)

Decrease in basic character

(d)

Resembles second and third row of d-block elements

58.

Sulphide ore is converted to oxide form by using the process________.

(a)

Calcination

(b)

Roasting

(c)

Smelting

(d)

Leaving

59.

The structure of hexaaquatitanium (III) ion is _______.

(a)

[Ti(H₂O)₆]³⁺

(b)

[Ti(H₂O)₆]^3-

(c)

[Ti(H₂O)₅]H₂O

(d)

[Ti(H₂O)₆]

60.

In co-ordination complexes, ligand ammonia is written as _______.

(a)

ammine

(b)

amine

(c)

ammonal

(d)

none of these

61.

Which is not an anionic complex?

(a)

[Cu(NH₃)₄]Cl₂

(b)

K₄[Fe(CN)₆]

(c)

K₃[Fe(CN)₆]

(d)

[NiCl₄]^2-

62.

According to CFT, five d-orbitals of an octahedral complex split to give _______.

(a)

One orbital with lower energy and four orbitals with higher energy

(b)

Two orbitals with lower energy and three orbitals with higher energy

(c)

Three orbitals with lower energy and two orbitals with higher energy

(d)

Four orbitals with lower energy and one orbital with higher energy.

63.

Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is _______.

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

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Answers Key:

Multiple Choice Question

63 x 1 = 63

(d)
Acetic acid

(b)
tranquilizens

(a)
nature of the amino acids

(a)
vitamin B₆

(b)
Sucrose

10.

(b)
3F

11.

(b)
(A + Bλ_∞)

12.

(d)
Li

13.

(b)
intermolecular hydrogen bonding

14.

(b)
the iodoform test

15.

(d)
milk of magnesia

16.

17.

18.

(b)
decreases

19.

(d)
both (b) and (c)

20.

(b)
3

21.

(d)
ether

22.

23.

(a)
meso-oxalic acid

24.

(b)
decreases

25.

26.

27.

(b)
formic acid

28.

(d)
temperature increases

29.

(b)
CIO₄^- is the conjugate base of HCIO₄

30.

31.

32.

33.

(a)
physical adsorption

34.

35.

(b)
catalyst

36.

(b)
pseudo first

37.

(b)
one

38.

(b)
Depends on the concentration of reactants present in excess

39.

(b)
mol litre^-1 sec^-1

40.

41.

42.

43.

44.

45.

(d)
Both (a) and (b)

46.

(b)
amorphous, isotropy

47.

48.

(b)
4 and 4

49.

(a)
Some of anionic sites are occupied by unpaired electron

50.

51.

(d)
All of these

52.

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

53.

(b)
increases

54.

(a)
Boron nitride

55.

(a)
[Noble gas]n - 1d^1-10ns^1-2

56.

(d)
Ce⁴⁺and Yb²⁺acquire f⁰ and f¹⁴ configuration

57.

(b)
Increase in tendency to act as reducing agents

58.

(b)
Roasting

59.

(a)
[Ti(H₂O)₆]³⁺

60.

(a)
ammine

61.

(a)
[Cu(NH₃)₄]Cl₂

62.

63.

(b)
2,4

12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 Set B

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