WBJEE Chemistry Test - 7 | 40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests JEE

QUESTION: 1

Which of the following species can act both as Bronsted acid and base ?
NH₂⁻ 2. HCO₃⁻ 3. NH₄⁺ 4. HSO₄⁻
Select the correct answer using the codes given below :

A.
1, 2 and 4
B.
1, 3 and 4
C.
2 and 4
D.
1 and 3

Solution:

QUESTION: 2

The compound 'A' when treated with methyl alcohol and few drops of H₂SO₄ give wintergreen smell. The compound 'A' is

A.
Succinic acid
B.
Salicylic acid
C.
Tartaric acid
D.
Oxalic acid

Solution:

QUESTION: 3

Which of the following does not turn Schiff's reagent to pink ?

A.
Formaldehyde
B.
Benzaldehyde
C.
Acetone
D.
Methyl chloride

Solution:

QUESTION: 4

Which is most soluble in water?

A.
AgCl
B.
AgBr
C.
AgI
D.
AgF

Solution:

QUESTION: 5

By passing H₂S gas in acidified KMnO₄, we get

A.
K₂S
B.
S
C.
K₂SO₃
D.
MnO₂

Solution:

QUESTION: 6

In H₂O₂ molecule, the angle between two O-H planes is

A.
90º
B.
101º
C.
103º
D.
105º

Solution:

QUESTION: 7

For the energy levels in an atom, which one of the following statements is correct?

A.
There are seven principal electron energy levels
B.
The second principal energy level has four sub-energy levels and contain a maximum of eight electrons
C.
The principal energy level N can have a maximum of 32 electrons
D.
The 4s sub-energy has high energy than 3d sub-energy level

Solution:

QUESTION: 8

The effect of atoms or groups loosing electrons towads a carbon atom is called

A.
+ I effect
B.
- I effect
C.
+ N effect
D.
- N effect

Solution:

QUESTION: 9

Cane sugar on hydrolysis gives

A.
Glucose
B.
Fructose
C.
Both
D.
None

Solution:

QUESTION: 10

A liquid is in equilibrium with its vapour at its boiling point. The molecules in these two phases will have equal

A.
kinetic energy
B.
potential energy
C.
internal energy
D.
intermolecular energy

Solution:

QUESTION: 11

The heats of combustion of carbon and carbon monoxide are -390 KJ and -278 KJ respectively. The heat of formation of carbon monoxide is

A.
-112 KJ
B.
-668 KJ
C.
112 KJ
D.
668 KJ

Solution:

QUESTION: 12

The half life of a reaction is found to be inversely proportional to the cube of its initial concentration of the reactants. The order of the reaction is

A.
2
B.
5
C.
3
D.
4

Solution:

QUESTION: 13

If a gas at constant temperature and pressure expands, then its

A.
internal energy increases
B.
internal energy decreases
C.
internal energy remains constant
D.
entropy increases and then decreases

Solution:

QUESTION: 14

Vanishing creams differ from other creams due to the presence of

A.
glycerine
B.
olive oil
C.
almond oil
D.
mineral oil

Solution:

QUESTION: 15

The number of ether metamers respresented by formula C₄H₁₀O is

A.
4
B.
3
C.
2
D.
1

Solution:

QUESTION: 16

Silver chloride dissolves in excess of NH₄OH. The cation present in the resulting solution is

A.
Ag⁺
B.
[Ag(NH₃)₂]⁺
C.
[Ag(NH₃)₄]⁺
D.
[Ag(NH₃)₆]⁺

Solution:

QUESTION: 17

The main function of roasting is

A.
to remove the volatile matter
B.
to convert the ore into oxide
C.
Both (A) and (B)
D.
to make slag

Solution:

QUESTION: 18

The compressibility factor of an ideal gas is

A.
0
B.
1
C.
2
D.
4

Solution:

QUESTION: 19

Inorganic benzene contains

A.
C, H, Al
B.
C, H, B
C.
B, N, H
D.
C, N, H

Solution:

QUESTION: 20

Which among CH₄, SiH₄, GeH₄ and SnH₄ is most volatile?

A.
CH₄
B.
SiH₄
C.
GeH₄
D.
SnH₄

Solution:

QUESTION: 21

Phosphine is prepared by the action of

A.
P and H₂SO₄
B.
P and NaOH
C.
P and H₂S
D.
P and HNO₃

Solution:

QUESTION: 22

The absorption of hydrogen on palladium is called

A.
Hydration
B.
Occlusion
C.
Reduction
D.
Hydrogenation

Solution:

QUESTION: 23

The activity of carbon-14 in a piece of ancient wood is only 12.5%. If the half life period of carbon-14 is 5760 years, the age of the piece of wood will be

A.
17.281 x 10² years
B.
172.81 x 10²years
C.
1.7281 x 10² years
D.
1728.1 x 10²years

Solution:

QUESTION: 24

Which of the following pair represents stereoisomerism?

A.
chain isomerism and rotational isomerism
B.
optical isomerism and geometric isomerism
C.
linkage isomerism and geometric isomerism
D.
structural isomerism and geometric isomerism

Solution:

QUESTION: 25

Aniline reacts with concentrated HNO₃ to give :

A.
B.
C.
D.

Solution:

QUESTION: 26

Which of the following is a polyamide?

A.
teflon
B.
nylon-66
C.
terylene
D.
bakelite

Solution:

QUESTION: 27

Teflon is a polymer, monomer of which is

A.
Difluoroethane
B.
Monofluoroethane
C.
Tetrafluoroethene
D.
Tetrafluoroethane

Solution:

QUESTION: 28

The oxidation number of S in S²⁻ is

A.
-2
B.
0
C.
-6
D.
+2

Solution:

QUESTION: 29

Ionic addition of bromine to cis-2-butene yields

A.
meso-2,3-dibromobutane
B.
racemic-2,3-dibromobutane
C.
d-2,3-dibromobutane
D.
l-2,3-dibromobutane

Solution:

QUESTION: 30

Due to Frankel defect, the density of ionic solids

A.
decreases
B.
increases
C.
does not change
D.
changes

Solution:

QUESTION: 31

Solubility product constants (K_sp) of salts of types MX, MX₂ and M₃X at temperature 'T' are 4.0 x 10^-8, 3.2 x 10^-14 and 2.7 x 10^-15, respectively. Solubilities (mol dm^-3) of the salts at temperature 'T' are in the order

A.
MX > MX₂ > M₃X
B.
M₃X > MX₂ > MX
C.
MX₂ > M₃X > MX
D.
MX > M₃X > MX₂

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

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Shape of NH₃ molecule is tetrahedral.
Reason(R): In NH₃ nitrogen is sp³ hydridised.

A.
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
B.
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.
C.
Assertion is true but Reason is false.
D.
Assertion is false but Reason is true.

Solution:

QUESTION: 34

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is

A.
CH₃(CH₂)₁₅N⁺)CH₃)₃Br⁻
B.
CH₃(CH₂)11OSO₃⁻Na⁺
C.
CH₃(CH₂)₆COO⁻Na⁺
D.
CH₃(CH₂)₁₁N⁺(CH₃)₃Br⁻

Solution:

The CMC (critical micelle concentration) value of the surfactants depends both on the size of the hydrophobic chain (tail) and size of the hydrophilic domain (head). The two contributions are counteracting with a lower CMC for a larger hydrophobic chain and a higher hydrophilic domain.

QUESTION: 35

Toluic acid on reaction with Br₂ + Fe gives

A.
B.
C.
D.

Solution:

*Multiple options can be correct

QUESTION: 36

Which of the following sets of phenomenon shown by the radiations proves the dual nature of radiations

A.
Scintillation and interference
B.
Interference and diffraction
C.
Interference and photoelectric effect
D.
Diffraction and photoelectric effect

Solution:

*Multiple options can be correct

QUESTION: 37

In the reaction
Cl₂+OH⁻→ Cl⁻ + ClO₄⁻ + H₂O,chlorineis

A.
Oxidized
B.
Reduced
C.
Disproportionation
D.
Neither oxidized nor reduced

Solution:

*Multiple options can be correct

QUESTION: 38

The compounds used as refrigerant are :

A.
NH₃
B.
CCl₄
C.
CF₄
D.
CF₂Cl₂

Solution:

*Multiple options can be correct

QUESTION: 39

Which of the following are the examples of aldol condensation ?

A.
B.
C.
D.

Solution:

*Multiple options can be correct

QUESTION: 40

Which statement(s) about cathode rays is/are correct?

A.
They travel in straight lines towards cathode
B.
They produce florescent discharge through the walls of the tube
C.
They produce heating effect
D.
They can affect photographic plate

Solution:

WBJEE Chemistry Test - 7

40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests | WBJEE Chemistry Test - 7

Which of the following species can act both as Bronsted acid and base ? NH₂⁻ 2. HCO₃⁻ 3. NH₄⁺ 4. HSO₄⁻ Select the correct answer using the codes given below :

1, 2 and 4

1, 3 and 4

2 and 4

1 and 3

The compound 'A' when treated with methyl alcohol and few drops of H₂SO₄ give wintergreen smell. The compound 'A' is

Succinic acid

Salicylic acid

Tartaric acid

Oxalic acid

Which of the following does not turn Schiff's reagent to pink ?

Formaldehyde

Benzaldehyde

Acetone

Methyl chloride

AgCl

AgBr

AgI

AgF

K₂S

S

K₂SO₃

MnO₂

There are seven principal electron energy levels

The second principal energy level has four sub-energy levels and contain a maximum of eight electrons

The principal energy level N can have a maximum of 32 electrons

The 4s sub-energy has high energy than 3d sub-energy level

+ I effect

- I effect

+ N effect

- N effect

Glucose

Fructose

Both

None

kinetic energy

potential energy

internal energy

intermolecular energy

-112 KJ

-668 KJ

112 KJ

668 KJ

2

5

3

4

internal energy increases

internal energy decreases

internal energy remains constant

entropy increases and then decreases

glycerine

olive oil

almond oil

mineral oil

4

3

2

1

Ag⁺

[Ag(NH₃)₂]⁺

[Ag(NH₃)₄]⁺

[Ag(NH₃)₆]⁺

to remove the volatile matter

to convert the ore into oxide

Both (A) and (B)

to make slag

0

1

2

4

C, H, Al

C, H, B

B, N, H

C, N, H

CH₄

SiH₄

GeH₄

Which of the following species can act both as Bronsted acid and base ?
NH₂⁻ 2. HCO₃⁻ 3. NH₄⁺ 4. HSO₄⁻
Select the correct answer using the codes given below :