Engineering Entrance Sample Papers

Redox Reactions Questions

Redox (Chemistry) Practice Paper
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Questions on Oxidation-Reduction Reactions (Redox Reactions):

Redox Multiple Choice Questions

Question 1
In the reaction between ozone and hydrogen peroxide, H2O2 acts as
A
Bleaching agent
B
Both oxidising and bleaching agent
C
Oxidising agent
D
Reducing agent
Question 2
A metal ion M3+ after loss of three electrons in a reaction will have an oxidation number equal to

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A
+ 2
B
+ 3
C
Zero
D
+ 6
Question 3
Starch paper is used to test for the presence of
A
Iodide ion
B
Iodine
C
Oxidising agent
D
Reducing agent
Question 4
The oxidation number of C in CO2 is
A
– 2
B
+ 2
C
– 4
D
+ 4
Question 5
When NaCl is dissolved in water the sodium ion becomes?
A
Reduced
B
Hydrated
C
Hydrolysed
D
Oxidised
Question 6
The oxidation state of I in H4IO6 is
A
+ 5
B
– 1
C
+ 1
D
+ 7
Question 7
The oxidation state of sulphur in SO42– is
A
2
B
– 6
C
4
D
6
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
3
B
3/7
C
7/3
D
7
Question 9
Oxidation number of S in Na2SO4 is
A
+ 2
B
+ 6
C
– 6
D
– 2
Question 10
Oxidation state of ‘S’ in H2SO3
A
+ 3
B
+ 2
C
+ 6
D
+ 4
Question 11
The oxidation state of nitrogen in N3H is
A
+ 1/3
B
- 1/3
C
+ 3
D
-1
Question 12
HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. It is due to their
A
Maximum oxidation number
B
Solubility ability
C
Minimum oxidation number
D
Minimum number of valence electrons
Question 13
The oxidation number of As is
A
None of these
B
+ 2 and + 3
C
+ 3 and + 4
D
+ 3 and + 5
Question 14
The number of moles of KMnO4 reduced by one mole of KI  in alkaline medium is:
A
One
B
One fifth
C
Two
D
five
Question 15
The oxidation state of each oxygen atom in Na2O2 is

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A
– 2 each
B
– 1 each
C
– 2 and zero
D
None of these
Question 16
For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
A
5/2
B
7/2
C
3/2
D
1/2
Question 17
To prevent rancidification of food material, which of the following is added

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A
None of these
B
Anti-oxidant
C
Reducing agent
D
Oxidising agent
Question 18
The oxidation number of hydrogen in LiH is
A
+ 1
B
0
C
2
D
– 1
Question 19
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
2
B
6
C
4
D
8
Question 20
The oxidation state of I in IPO4 is
A
+7
B
+1
C
+5
D
+3
There are 20 questions to complete.
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