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 A→B 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 (Eº) for the following half-cell reactions are
The (Eº) for the cell reaction will be
The (Eº) for the cell reaction will be
1
–0.35 V
2
0.35 V
3
–1.17 V
4
1.17 V
About Chemical Reactions - WBJEE-JENPAS-UG
Chemical Reactions is a vital chapter for WBJEE-JENPAS-UG aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Chemical Reactions PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Chemical Reactions carry the most weight. Then, tackle the questions iteratively to solidify your understanding.