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Science
Oxidation Reduction
Quiz 3
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Q.1
An element's oxidation numbers became more negative 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.2
Which element was reduced in the reaction below?Na + PbCl→ Pb + NaCl
Na
Pb
Cl
No element was reduced
Q.3
Which element was oxidized in the reaction below?Na + PbCl2 → Pb + NaCl
Na
Pb
Cl
No element was reduced
Q.4
If oxidation happened, then...
something gained electrons
reduction also happened
flames are always involved
oxygen is always involved
Q.5
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
Q.6
Which statement is true:Mg → Mg+ 2e–
Mg gains 2 electrons
Mg2+ loses 2 electrons
Mg loses 1 electron
Mg loses 2 electrons
Q.7
The below reaction is an example of _________reaction.F2 → 2 F- + 2 e-
Oxidation
Reduction
Neutralization
decomposition
combustion
Q.8
Identify the species reduced in the following reaction.Fe(s) + 2 Ag+(aq) → Fe2+(aq) + 2 Ag(s)
Fe
Ag
none of these
None of the above
Q.9
Determine the oxidation number of the selected element in each ion/ compound. a) N in N2O4 b) Cr in CrO4c) I in IO3-
+8, -6, +5
+2, +8, +6
+4, +6, +5
-4, -6, -5
-4, -8, -6
Q.10
What is the oxidation number of Nitrogen in HNO3
-7
-5
+5
+7
+2
0 h : 0 m : 1 s
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