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WBJEE Chemistry Test - 2

40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests | WBJEE Chemistry Test - 2

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Attempt WBJEE Chemistry Test - 2 | 40 questions in 60 minutes | Mock test for JEE preparation | Free important questions MCQ to study WBJEE Sample Papers, Section Wise & Full Mock Tests for JEE Exam | Download free PDF with solutions

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: Bronsted lowry acid base definition:- Acid - which can donate H+ Base - which can accept H+ HCO3(-) acts as acid by donating H+ and becomes CO3(2-) , acts as base by accepting H+ and becomes H2CO3 similarly HSO4(-) becomes SO4(2-) and H2SO4. NH2(-) becomes NH3 and NH(2-)

QUESTION: 2

Which of the following will not give iodoform test?

A.
Ethanol
B.
Ethanal
C.
Isopropyl alcohol
D.
Benzyl alcohol

Solution:

QUESTION: 3

Acetone and acetaldehyde are differentiated by

A.
HNO₂
B.
I₂
C.
NaOH + I₂
D.
[Ag(NH₃)₂]⁺

Solution:

Acetaldehyde gives silver mirror with Tollen's reagent
CH₃CHO + 2[Ag(NH₃)₂] OH → CH₃COONH₄ + 2Ag + H₂O + 3NH₃
Acetone does not give this test

QUESTION: 4

Nitrates of all the metals are

A.
Coloured
B.
Soluble in water
C.
Unstable
D.
Insoluble in water

Solution:

QUESTION: 5

Which of the following is not a preliminary test used to detect ions

A.
Borax bead test
B.
Flame test
C.
Brown ring test
D.
Permanganate test

Solution:

QUESTION: 6

The wavelength of light waves is inversely proportional to its

A.
radius
B.
energy
C.
velocity
D.
Quantum number

Solution:

QUESTION: 7

Which of the following alkyl group has the maximum + I effect?

A.
CH₃ -
B.
CH₃CH₂-
C.
(CH₃)₂CH-
D.
(CH₃)₃C-

Solution:

QUESTION: 8

The enzymes which convert glucose and fructose into ethyl alcohol is

A.
diastase
B.
invertase
C.
maltase
D.
zymase

Solution:

QUESTION: 9

Which of the the following has least bond energy?

A.
F₂
B.
H₂
C.
N₂
D.
O₂

Solution:

QUESTION: 10

The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 KJ mol⁻¹ respectively .The enthalpy of formation of carbon monoxide per mol is

A.
-110.5 KJ
B.
-676.5 KJ
C.
+676.5 KJ
D.
110.5 KJ

Solution:

QUESTION: 11

A glass bulb is filled with NO₂ gas and immersed in an ice bath at 0°C which becomes colourless after some time . This colourless gas will be

A.
NO₂
B.
N₂O
C.
N₂O₄
D.
N₂O₅

Solution:

QUESTION: 12

Units of rate constant for first and zero order reaction in terms of molarity (M) units are resectively

A.
sec⁻¹,M sec⁻¹
B.
sec⁻¹,M
C.
M sec⁻¹,sec⁻¹
D.
M,sec⁻¹

Solution:

QUESTION: 13

Given that

A.
−292−292 kJ/mole
B.
378 kJ/mole
C.
195 kJ/mole
D.
−2044−2044 kJ/mole

Solution:

QUESTION: 14

The soaps are salts of higher fatty acids containing chains of

A.
8-10 C atoms
B.
10-12 C atoms
C.
12-14 C atoms
D.
16-18 C atoms

Solution:

QUESTION: 15

The systematic name of (CH₃)₂CH-COOH is

A.
2-Propanoic acid
B.
Isobutanoic acid
C.
2-Methylpropanoic
D.
2-Methylbutanoic acid

Solution:

QUESTION: 16

2,4 Dinitrophenyl hydrazine is an example for :

A.
Tridentate ligand
B.
Monodentate ligand
C.
Polydentate ligand
D.
Didentate ligand

Solution:

is a monodentate ligand.

QUESTION: 17

The process associated with manufacture of sodium carbonate is known as

A.
Haber
B.
Solvay
C.
Castner
D.
Chamber

Solution:

QUESTION: 18

The density of gas at 27°C and 1 atm is d. Pressure remaining constant at which of the following temperatures will its density become 0.75 d ?

A.
20°C
B.
30°C
C.
400 K
D.
300 K

Solution:

At same pressure and same number of moles¸

QUESTION: 19

What is formed when boron is heated with concentrated H₂SO₄?

A.
BSO₄
B.
H₂BO₃
C.
H₃BO₃
D.
H₃BSO₄

Solution:

QUESTION: 20

Which does not exist?

A.
[SiCl₆]²⁻
B.
[GeF₆]²⁻
C.
[CCl₆]²⁻
D.
[SnCl₆]²⁻

Solution:

QUESTION: 21

The P-P-P bond angle in white phosphorus is

A.
120°
B.
90°
C.
109°28°
D.
60°

Solution:

QUESTION: 22

Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

A.
Phosphorus pentoxide
B.
Active charcoal
C.
Anhydrous calcium chloride
D.
Na₃PO₄

Solution:

QUESTION: 23

Which of the following isomerism is not exhibited by alkanes?

A.
chain isomerism
B.
position isomerism
C.
geometrical isomerism
D.
all of these

Solution:

QUESTION: 24

Heaviest particle is

A.
Meson
B.
Neutron
C.
Proton
D.
Electron

Solution: The heaviest particle of an atom is its neutron. It is due to its weight difference from others. It is 0.18% heavier than the proton which makes it the most heaviest.

QUESTION: 25

Which of the following on hydrolysis forms acetic acid?