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