WorksheetsREDOX
Total questions: 8
Worksheet time: 23mins
Name
Class
Date
1.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
2.
Which of the following half reactions correctly represents a reduction half reaction?
a)
Fe →Fe2+ + 2e-
b)
Pb4+ + 2e- →Pb2+
c)
2O-2 →O2 + 4e-
d)
Fe + 3e- →Fe3+
3.
In a voltaic cell electrons flow
a)
through the salt bridge
b)
from the cathode to the anode through the wire
c)
from the anode to the cathode through the wire
4.
Which of the following represents reduction?
a)
C → CO
b)
N2 → NH3
c)
Zn → Zn2+
d)
H2 → H2O
5.
In a voltaic cell, the salt bridge is necessary for
a)
the movement of electrons to create a current
b)
the movement of ions to create a current
c)
the movement of electrons to maintain the neutrality of solution
d)
the movement of ions to maintain the neutrality of solution
6.
Which energy conversion shown below takes place in an electrochemical cell?
a)
Electrical to chemical
b)
Mechanical to chemical
c)
Mechanical to electrical
d)
Chemical to electrical
7.
What is the oxidation number of iodine in KIO3?
a)
0
b)
-1
c)
+5
d)
+1
8.
Which species is oxidised in the following reaction?
2I- + Br2 --> I2 + 2Br-
2I- + Br2 --> I2 + 2Br-
a)
I- is oxidised to I2
b)
Br2 is oxidised to Br-
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