WBJEE Chemistry Test - 3 | 40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests JEE

QUESTION: 1

Which one of the following is the weakest Lewis base ?

A.
CH₃⁻
B.
NH₂⁻
C.
OH
D.
F⁻

Solution:

QUESTION: 2

R―CH₂―CH₂ ―OH can be converted into RCH₂CH₂COOH by the following sequence of steps

A.
PBr₃, KCN, H₃O⁺
B.
PBr₃, KCN, H₂/Pt
C.
KCN, H₃O⁺
D.
HCN, PBr₃, H₃O⁺

Solution:

QUESTION: 3

Schiff's reagent gives pink colour with

A.
Acetaldehyde
B.
Acetone
C.
Acetic acid
D.
Methyl acetate

Solution:

QUESTION: 4

Which of the nitrates on strong heating leaves the metal as the residue?

A.
AgNO₃
B.
Pb(NO₃)₂
C.
Cu(NO₃)₂
D.
Al(NO₃)₃

Solution:

QUESTION: 5

Which of the following does not show electromeric effect?

A.
ethers
B.
ketones
C.
aldehydes
D.
alkenes

Solution:

QUESTION: 6

Which one of the following molecules has the smallest bond angle?

A.
NH₃
B.
PH₃
C.
H₂O
D.
H₂Se

Solution:

Molecules      Bond angle
NH₃        -       107.2º
PH₃        -       93.2º
H₂O        -       104.45º
H₂Se       -       90.6º
H₂S        -       92.1º

QUESTION: 7

Concentrated nitric acid is added before proceeding to test for group III members. This is to

A.
Oxidise any remaining H₂S
B.
Convert ferrous ion into ferric ion
C.
Form nitrates which give granular precipitates
D.
Increase ionisation of ammonium hydroxide

Solution:

QUESTION: 8

What is the maximum number of electrons that can be accommodated in an atom in which the highest principal quantum number value is 4?

A.
10
B.
18
C.
36
D.
54

Solution:

QUESTION: 9

In DNA the complementary beses are

A.
adenine and thymine ; guanine and cytosine
B.
uracil and adenine ; cytosine and guanine
C.
adenine and guanine ; thymine and cytosine
D.
adenine and thymine ; guanine and uracil

Solution:

QUESTION: 10

The heat of formation of the compound in the following reaction is
H₂(g) + Cl(g)→ 2HCl(g)+44 Kcal

A.
- 44 Kcal mol⁻¹
B.
-22 Kcal mol⁻¹
C.
11 Kcal mol⁻¹
D.
-88 Kcal mol⁻¹

Solution:

QUESTION: 11

The equilibrium between water and its vapour, in an open-vessel

A.
can be achieved
B.
depends upon pressure
C.
can not be achieved
D.
depends upon temperature

Solution: In an open vessel, the water vapour diffuse into air and therefore, the concentration of water vapour above water surface is negligible.
The reverse process of condensation of vapour into liquid form is almost absent.
Therefore, evaporation process continues, till the entire water changes into vapour form.
Therefore, in an open vessel, the water vapour system is never in equilibrium.
Finally the whole water will diffuse into air as water vapour.

QUESTION: 12

Which of the following is not chiral ?

A.
2-Hydroxypropanoic acid
B.
2-Butanol
C.
2,3-Dibromopentane
D.
3-Bromopentane

Solution:

QUESTION: 13

In a reaction 2A + B → A₂B, the reactant A will disappear at

A.
half the rate at that B will decrease
B.
the same rate at that B will decrease
C.
the same rate at that A₂B will from
D.
twice the rate at that B will decrease

Solution:

QUESTION: 14

Parathion is

A.
an organic phosphorus compound
B.
chlorinated aromatic compound
C.
chlorinated aliphatic compound
D.
benzene derivative

Solution:

QUESTION: 15

What is the entropy change (in J K^-1 mol^-1), when one mole of ice is converted into water at 0ºC? (The enthalpy change for the conversion of ice to liquid water is 6.0kJ mol^-1 at 0ºC)

A.
2.013 J K^-1 mol^-1
B.
2.198 J K^-1 mol^-1
C.
21.98 J K^-1 mol^-1
D.
20.13 J K^-1 mol^-1

Solution:

QUESTION: 16

A metal M readily forms water soluble sulphate MSO₄. Water becomes inert on heating. The hydroxide is soluble in NaOH. Then M is

A.
Be
B.
Ca
C.
Mg
D.
Sr

Solution:

QUESTION: 17

The most stable complex among the following is

A.
K₃[Al(C₂O₄)₃]
B.
[Pt(en)₂]Cl₂
C.
[Ag(NH₃)₂]Cl
D.
K₂[Ni(EDTA)]

Solution:

QUESTION: 18

Which of the following statement is correct with respect to the property of elements with increase in atomic number in the carbon family(group 14)?

A.
Their metallic character decreases
B.
The stability of +2 oxidation state increases
C.
Their ionization energy increases
D.
Their atomic size decreases

Solution:

QUESTION: 19

What is formed when boron is heated with concentrated H₂SO₄?

A.
BSO₄
B.
H₂BO₃
C.
H₃BO₃
D.
H₃BSO₄

Solution:

QUESTION: 20

Air at sea level is dense. This is a practical application of

A.
Boyle's law
B.
Charle's law
C.
Avogadro's law
D.
Dalton's law

Solution:

QUESTION: 21

Among the following hydrides which is more stable

A.
NH₃
B.
PH₃
C.
AsH₃
D.
SbH₃

Solution:

QUESTION: 22

Which one of the following metals reacts with water at room temperature ?

A.
Silver
B.
Iron
C.
Aluminium
D.
Sodium

Solution:

QUESTION: 23

The number of optical iosmers of the compound CH₃CHBrCHBrCOOH is

A.
0
B.
1
C.
3
D.
4

Solution:

QUESTION: 24

The radiation which has highest penetrating power is

A.
α-rays
B.
β-rays
C.
γ-rays
D.
Cathode rays

Solution:

QUESTION: 25

Aniline reacts with phosgene and KOH to form

A.
B.
C.
D.

Solution:

QUESTION: 26

The product of addition polymerization reaction is

A.
PVC
B.
nylon
C.
terylene
D.
polyamide

Solution:

QUESTION: 27

Which of the following is used for making horses, shoe heels and stoppers?

A.
PMMA
B.
buna-S
C.
styron
D.
neoprene

Solution:

QUESTION: 28

The oxidation number of Mn in KMnO₄ is

A.
+7
B.
-7
C.
+1
D.
-1

Solution:

QUESTION: 29

In crystal structure of sodium chloride, the arrangement of Cl⁻ ions is

A.
fcc
B.
bcc
C.
Both fcc and bcc
D.
None of these

Solution:

QUESTION: 30

What is the number of asymmetric carbon atoms present in α-D-glucopyranose molecule ?

A.
Two
B.
Three
C.
Four
D.
Five

Solution:

QUESTION: 31

α-D-(+)-glucose and β-D-(+)-glucose are

A.
Anomers
B.
Enantiomers
C.
Conformers
D.
Epimers

Solution:

QUESTION: 32

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is

A.
benzoic acid
B.
salicylaldehyde
C.
salicylic acid
D.
phthalic acid

Solution:

QUESTION: 33

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

A.
R₄Si
B.
RSiCl₃
C.
R₂SiCl₂
D.
R₃SiCl

Solution:

QUESTION: 34

The IUPAC name of [Ni(NH₃)₄] [NiCl₄] is

A.
Tetrachloronickel (II)-tetraamminenickel (II)
B.
Tetraamminenickel (II)-tetrachloronickel (II)
C.
Tetraamminenickel (II)-tetrachloronickelate (II)
D.
Tetrachloronickel (II)-tetraamminenickelate (0)

Solution:

QUESTION: 35

A and B in the following reactions are:

A.
B.
C.
A = RR'CH₂CN, B = NaOH
D.

Solution:

*Multiple options can be correct

QUESTION: 36

The statements that are true for the long form of the periodic table are :

A.
It reflects the sequence of filling the electrons in the order of sub-energy level s,p,d and f .
B.
It helps to predict the stable valency states of the elements.
C.
It reflects tends in physical and chemistry properties of the elements.
D.
It helps to predict the relative ionicity of the bond between any two elements.

Solution:

*Multiple options can be correct

QUESTION: 37

For the reaction A + 3 B → C , the differential form of the rate law is

A.
B.
C.
D.

Solution:

*Multiple options can be correct

QUESTION: 38

In the reaction

the amine(s) X is(are)

A.
NH₃
B.
CH₃NH₂
C.
(CH₃)₂NH
D.
(CH₃)₃N

Solution:

*Multiple options can be correct

QUESTION: 39

Which of the following statements is/are incorrect?

A.
The volume of a gas always increases when the temperature is increased
B.
Equal volume of gases under the same conditions of temperature and pressure contain the same number of molecules
C.
The kinetic energy of a molecule is zero at 0ºC
D.
A gas in a closed container exerts higher pressure at the bottom than at the top due to gravity

Solution:

QUESTION: 40

Boron readily dissolves in

A.
conc.HCl
B.
fused NaOH at 673K
C.
fused Na₂CO₃ + NaNO₃ at 1173K
D.
a mixture of conc. HNO₃ and conc. H₂SO₄(1 : 2)

Solution:

WBJEE Chemistry Test - 3

40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests | WBJEE Chemistry Test - 3

Which one of the following is the weakest Lewis base ?

CH₃⁻

NH₂⁻

OH

F⁻

R―CH₂―CH₂ ―OH can be converted into RCH₂CH₂COOH by the following sequence of steps

PBr₃, KCN, H₃O⁺

PBr₃, KCN, H₂/Pt

KCN, H₃O⁺

HCN, PBr₃, H₃O⁺

Schiff's reagent gives pink colour with

Acetaldehyde

Acetone

Acetic acid

Methyl acetate

AgNO₃

Pb(NO₃)₂

Cu(NO₃)₂

Al(NO₃)₃

ethers

ketones

aldehydes

alkenes

Oxidise any remaining H₂S

Convert ferrous ion into ferric ion

Form nitrates which give granular precipitates

Increase ionisation of ammonium hydroxide

10

18

36

54

adenine and thymine ; guanine and cytosine

uracil and adenine ; cytosine and guanine

adenine and guanine ; thymine and cytosine

adenine and thymine ; guanine and uracil

can be achieved

depends upon pressure

can not be achieved

depends upon temperature

2-Hydroxypropanoic acid

2-Butanol

2,3-Dibromopentane

3-Bromopentane

half the rate at that B will decrease

the same rate at that B will decrease

the same rate at that A₂B will from

twice the rate at that B will decrease

an organic phosphorus compound

chlorinated aromatic compound

chlorinated aliphatic compound

benzene derivative

Be

Ca

Mg

Sr

K₃[Al(C₂O₄)₃]

[Pt(en)₂]Cl₂

[Ag(NH₃)₂]Cl

K₂[Ni(EDTA)]

Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

BSO₄

H₂BO₃

H₃BO₃

H₃BSO₄

Boyle's law

Charle's law

Avogadro's law

Dalton's law

NH3

PH3

AsH3

SbH3

Silver

Iron

Aluminium

NH₃

PH₃

AsH₃

SbH₃