WBJEE-JENPAS-UG SERIES Chemistry
Chemical Reactions
15 previous year questions.
Volume: 15 Ques
Yield: Medium
High-Yield Trend
6
2023 9
2022 Chapter Questions 15 MCQs
01
PYQ 2022
medium
chemistry ID: wbjee-je
Select the chemicals which can act as nucleophile.
1
Phenol
2
Acylium ion
3
Grignard reagent
4
Ammonia
02
PYQ 2022
hard
chemistry ID: wbjee-je
Which anion will be formed when ethyl 3-oxobutanate is treated with alkali?
1

2

3

4

03
PYQ 2022
hard
chemistry ID: wbjee-je
For a reaction, the rate constant K. is expressed as log10 K=14.2-C/T. Activation energy of the reaction is
1
2.303 CR
2
CR
3
C/2.303 R
4
C/R
04
PYQ 2022
easy
chemistry ID: wbjee-je

The Product 'A' is
1

2

3

4

05
PYQ 2022
medium
chemistry ID: wbjee-je

The product of the above reaction will be
1

2

3

4

06
PYQ 2022
medium
chemistry ID: wbjee-je
For a first order reaction AβB if initial concentration of A is [A]0, and the rate constant of the reaction is k, then concentration of the product ( x ) is related with time (t) as
1
x=[A]0(1-e-kt)
2
x=[A]0-e-kt
3
x=[A]0 e-kt
4
x=[A]0 (1+e-kt)
07
PYQ 2022
medium
chemistry ID: wbjee-je
Reaction of HNO3 with P2O5, at lower temperature produces
1
N2O4
2
NO
3
N2O3
4
N2O5
08
PYQ 2022
medium
chemistry ID: wbjee-je
The colour of the Ca-EDTA complex is
1
Blue
2
Wine-red
3
Colourless
4
Yellow
09
PYQ 2022
medium
chemistry ID: wbjee-je

The configuration of the reactant and the product in the above reaction, respectively, are
1
R, R
2
R, S
3
S, R
4
S, S
10
PYQ 2023
medium
chemistry ID: wbjee-je
Which of the following have all equivalent canonical structures ?
1
2
3
4
11
PYQ 2023
medium
chemistry ID: wbjee-je
The product(s) formed in the following reaction is (are):

1
2
3
4
12
PYQ 2023
medium
chemistry ID: wbjee-je
The dimension of the coefficient of viscosity is given by
1
2
3
4
13
PYQ 2023
medium
chemistry ID: wbjee-je
Which of the following statements about and are correct?
1
Both form oxoacids and respectively.
2
In each 'P' is joined with three 'O' atom and in each 'P' is joined with five 'O' atom.
3
In each 'P' is joined with three 'C atom and in each 'P' is joined with four 'O' atom.
4
In each 'P' is joined with four 'O' atom and in each 'P' is joined with six 'O' atom.
14
PYQ 2023
medium
chemistry ID: wbjee-je
Which of the following aqueous mixtures will function as buffer ?
1
NaCl + NaOH
2
Borax + Boric Acid
3
4
15
PYQ 2023
medium
chemistry ID: wbjee-je
The standard reduction potentials (EΒΊ) for the following half-cell reactions are
The (EΒΊ) for the cell reaction will be
The (EΒΊ) for the cell reaction will be
1
β0.35 V
2
0.35 V
3
β1.17 V
4
1.17 V