NEET-UG SERIES Chemistry
Redox Reactions
27 previous year questions.
Volume: 27 Ques
Yield: High
High-Yield Trend
2
2024 1
2022 1
2020 1
2018 1
2016 5
2014 1
2013 2
2012 2
2008 1
2003 3
2002 2
2000 1
1999 2
1995 2
1994 Chapter Questions 27 MCQs
01
PYQ 1994
hard
chemistry ID: neet-ug-
In which of the following reactions, there is no change in valency ?
1
2
3
4
02
PYQ 1994
medium
chemistry ID: neet-ug-
Phosphorus has the oxidation state of + 3 in
1
Phosphorous acid
2
Orthophosphoric acid
3
Hypophosphorous acid
4
Metaphosphoric acid
03
PYQ 1995
easy
chemistry ID: neet-ug-
Which of the following is a redox reaction ?
1
2
3
4
04
PYQ 1995
medium
chemistry ID: neet-ug-
The oxide which cannot act as a reducing agent is
1
2
3
4
05
PYQ 1999
medium
chemistry ID: neet-ug-
The oxidation number of phosphorus in pyrophosphoric acid is
1
+3
2
+1
3
+4
4
+5
06
PYQ 2000
medium
chemistry ID: neet-ug-
Which of the following element exhibit maximum oxidation state:
1
2
3
4
07
PYQ 2000
medium
chemistry ID: neet-ug-
Oxidation numbers of and are and respectively possible formula of compound is:
1
2
3
4
08
PYQ 2002
medium
chemistry ID: neet-ug-
Which of the following shows maximum number of oxidation states
1
Cr
2
Fe
3
Mn
4
V
09
PYQ 2002
medium
chemistry ID: neet-ug-
Which of the following is not a reducing agent?
1
SO2
2
H2O2
3
CO2
4
Al
10
PYQ 2002
medium
chemistry ID: neet-ug-
Which reaction is not feasible :-
1
2
3
4
11
PYQ 2003
easy
chemistry ID: neet-ug-
The oxidation states of sulphur in the anions SO32–, S2O42– and S2O62– follow the order-
1
S2O42–< SO32–< S2O62–
2
SO32–< S2O42–< S2O62–
3
S2O42–< S2O62–< SO32–
4
S2O62–< S2O42–< SO32–
12
PYQ 2008
easy
chemistry ID: neet-ug-
On the basis of the following values, the strongest oxidising agent is
13
PYQ 2008
medium
chemistry ID: neet-ug-
Number of moles of required to oxidise one mole of ferrous oxalate completely in acidic medium will be
1
0.6 mol
2
0.4 mole
3
7.5 moles
4
0.2 mole
14
PYQ 2012
medium
chemistry ID: neet-ug-
A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?
1
Cl
2
C
3
S
4
H
15
PYQ 2012
medium
chemistry ID: neet-ug-
When gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
1
zero to +1 and zero to -5
2
zero to -1 and zero to +5
3
zero to -1 and zero to +3
4
zero to +1 and zero to -3
16
PYQ 2013
medium
chemistry ID: neet-ug-
In the reaction 
A is
A is 1
HgSO4/H2SO4
2
Cu2Cl2
3
H3PO2 and H2O
4
H+/H2O
17
PYQ 2014
medium
chemistry ID: neet-ug-
The pair of compounds that can exist together is:
1
2
3
4
18
PYQ 2014
medium
chemistry ID: neet-ug-
The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives:
1
Mn2+ and O2
2
Mn2+ and O3
3
Mn4+ and MnO2
4
Mn4+ and O2
19
PYQ 2014
medium
chemistry ID: neet-ug-
In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is
1
+3
2
+6
3
-10
4
+5
20
PYQ 2014
medium
chemistry ID: neet-ug-
In acidic medium, changes to which has two (-O-O-) bonds. Oxidation state of Cr in is
1
5
2
3
3
6
4
-10
21
PYQ 2014
medium
chemistry ID: neet-ug-
(a) (b) Role of hydrogen peroxide in the above reactions is respectively -
1
Oxidizing in (a) and reducing in (b)
2
Reducing in (a) and oxidizing in (b)
3
Reducing in (a) and (b)
4
Oxidizing in (a) and (b)
22
PYQ 2016
medium
chemistry ID: neet-ug-
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reaction does not show oxidizing behaviour?
1
2
3
4
23
PYQ 2018
medium
chemistry ID: neet-ug-
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : is Then the species undergoing disproportionation is
1
2
3
4
24
PYQ 2020
medium
chemistry ID: neet-ug-
What is the change in oxidation number of carbon in the following reaction?
1
+4 to +4
2
0 to +4
3
-4 to +4
4
0 to -4
25
PYQ 2022
medium
chemistry ID: neet-ug-
Match List-I with List-II.
| List - I (Ores) | List - II (Composition) | ||
| (a) | Haematite | (i) | Fe3O3 |
| (b) | Magnetite | (ii) | ZnCO3 |
| (c) | Calamine | (iii) | Fe2O3 |
| (d) | Kaolinite | (iv) | [Al2(OH)4Si2O5] |
Choose the correct answer from the options given below:
1
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
2
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
3
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
4
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
26
PYQ 2024
medium
chemistry ID: neet-ug-
Which of the following set of ions act as oxidising agents?
1
Ce4+ and Tb4+
2
La3+ and Lu3+
3
Eu2+ and Yb2+
4
Eu2+ and Tb4+
27
PYQ 2024
medium
chemistry ID: neet-ug-
The oxidation states not shown by Mn in the given reaction is:
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below:
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below:
1
D and E only
2
B and D only
3
A and B only
4
B and E only
About Redox Reactions - NEET-UG
Redox Reactions is a vital chapter for NEET-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 Redox 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 Redox Reactions carry the most weight. Then, tackle the questions iteratively to solidify your understanding.