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Science
Oxidation Reduction
Quiz 2
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Q.1
What substance is oxidized in the following reaction?4Fe + 3O2 --> 2Fe2O3
Iron
Fluorine
Oxygen
None of these
Q.2
Determine the oxidation number of chromium in CrO42-.
5
6
4
2
Q.3
A decrease in oxidation number.
Oxidation
combination
reduction
All of above
Q.4
Substance that oxidizes another substance by accepting its electrons.
oxidising agent
reducing agent
combustion
None of these
Q.5
In which substance does sulfur have a negative oxidation number?
Na2S
SO2
S
Both A & B
Q.6
The oxidation number of Hydrogen in KH potassium hydride equals:
-1
+1
0
2
Q.7
What is the colour change of acidified KMnO4 solution when it is used as an oxidising agent?
from colourless to brown
from purple to colourless
from brown to colourless
from colourless to purple
Q.8
An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?
Iodide ions are oxidised due to gain of electrons.
Iodide ions are oxidised due to loss of electrons.
Iodide ions are reduced due to loss of electrons.
Iodide ions are reduced due to gain of electrons.
Q.9
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
Cu --> Cu+2
Cu + 2 e- --> Cu+2
Cu - 2e- --> Cu+2
Cu --> Cu+2 + 2 e-
Q.10
What is the oxidation number of iodine in KIO3?
5
1
0
-1
Q.11
Reduction is the ___________ of electrons.
loss
gain
transfer
share
Q.12
An element's oxidation numbers changed from zero to +2 during a reaction. What happened to that element?
It was oxidized
It was reduced
It was both oxidized and reduced
It was neither oxidized nor reduced
Q.13
If an atom lost electrons, it...
was burned
was reduced
was oxidized
it became negative
Q.14
Of the 5 types of reactions, which one(s) are oxidation-reduction?
all of them
only double replacement
double replacement and combustion
all of them except double replacement
Q.15
Which of the following is NOT an example of an oxidation reduction reaction?
metal rusting
acid neutralizing base
burning methane
photosynthesis
Q.16
Which of the following has an oxidation number of zero on the chlorine atom?
NaCl
Cl2
Cl-
ClO3-
Q.17
What is the oxidation number on the nitrogen in NO?
0
-1
-2
+2
Q.18
What is the oxidation number on the nitrogen in Mg3N2?
0
-2
-3
+3
Q.19
What is the oxidation number on the nitrogen in NO2-?
-1
+3
-3
+4
Q.20
An element's oxidation numbers remain the same during a reaction. What happened to that element?
It was oxidized
It was reduced
It was both oxidized and reduced
It was neither oxidized nor reduced
0 h : 0 m : 1 s
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