Engineering Entrance Sample Papers

Redox Reactions Questions

redox reaction example

Questions on Oxidation-Reduction Reactions (Redox Reactions):

Redox Multiple Choice Questions

Question 1
The oxidation state of each oxygen atom in Na2O2 is

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A
– 1 each
B
– 2 and zero
C
– 2 each
D
None of these
Question 2
In the reaction between ozone and hydrogen peroxide, H2O2 acts as
A
Bleaching agent
B
Oxidising agent
C
Reducing agent
D
Both oxidising and bleaching agent
Question 3
For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
A
7/2
B
5/2
C
1/2
D
3/2
Question 4
When NaCl is dissolved in water the sodium ion becomes?
A
Hydrated
B
Reduced
C
Hydrolysed
D
Oxidised
Question 5
The oxidation number of C in CO2 is
A
– 2
B
+ 4
C
+ 2
D
– 4
Question 6
To prevent rancidification of food material, which of the following is added

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A
Oxidising agent
B
Anti-oxidant
C
None of these
D
Reducing agent
Question 7
Oxidation number of S in Na2SO4 is
A
+ 6
B
+ 2
C
– 6
D
– 2
Question 8
The compound YBa2Cu3O7 which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual +3 oxidation state
A
7
B
3
C
3/7
D
7/3
Question 9
The oxidation state of sulphur in SO42– is
A
6
B
2
C
– 6
D
4
Question 10
Starch paper is used to test for the presence of
A
Oxidising agent
B
Reducing agent
C
Iodide ion
D
Iodine
Question 11
The oxidation state of I in H4IO6 is
A
+ 7
B
+ 5
C
– 1
D
+ 1
Question 12
The oxidation state of I in IPO4 is
A
+7
B
+3
C
+1
D
+5
Question 13
The oxidation state of nitrogen in N3H is
A
+ 3
B
+ 1/3
C
- 1/3
D
-1
Question 14
The most common oxidation state of an element is –2. The number of electrons present in its outermost shell is

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A
4
B
2
C
6
D
8
Question 15
Oxidation state of ‘S’ in H2SO3
A
+ 2
B
+ 6
C
+ 3
D
+ 4
Question 16
A metal ion M3+ after loss of three electrons in a reaction will have an oxidation number equal to

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A
+ 6
B
+ 2
C
Zero
D
+ 3
Question 17
The number of moles of KMnO4 reduced by one mole of KI  in alkaline medium is:
A
One
B
Two
C
five
D
One fifth
Question 18
The oxidation number of hydrogen in LiH is
A
– 1
B
2
C
0
D
+ 1
Question 19
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. It is due to their
A
Maximum oxidation number
B
Minimum oxidation number
C
Solubility ability
D
Minimum number of valence electrons
Question 20
The oxidation number of As is
A
None of these
B
+ 2 and + 3
C
+ 3 and + 5
D
+ 3 and + 4
There are 20 questions to complete.
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