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REDOX AND GALVANIC CELLS

Total questions: 30

Worksheet time: 8hrs 30mins

Name
Class
Date
1.

In a redox reaction, the reducing agent... (choose two options)

a)

is oxidised

b)

is reduced

c)

increases its oxidation number

d)

decreases its oxidation number

2.

In a redox reaction, the oxidising agent... (choose two options)

a)

is oxidised

b)

is reduced

c)

increases its oxidation number

d)

decreases its oxidation number

3.

The anions move towards the _______in a galvanic cell.

a)

anode

b)

cathode

4.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What species is reduced?

a)

Fe

b)

Cu2+

c)

Fe2+

d)

Cu

5.

In a Galvanic Cell, the salt bridge...

a)

completes the circuit so that electrons can flow through the wire

b)

maintains charge balance

c)

is soaked in an unreactive electrolyte such as KNO3

d)

all of the above

6.

Oxidation occurs at the...

a)

anode

b)

cathode

7.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
8.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

How many electrons are lost?

a)

0

b)

2

c)

4

d)

6

9.

What is the name of the negative electrode in an electrolytic cell?

a)

cathode

b)

anode

10.

The reaction is spontaneous in ...

a)

A Galvanic Cell

b)

A Electrolytic Cell

c)

Both Galvanic and Electrolytic cells

11.

What is the oxidation state of Nitrogen in N2 (g)?

a)

4

b)

6

c)

2

d)

0

12.
Which are examples of reduction?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
13.

The standard electrode potential of Pb2+/ Pb and Cu2+/ Cu is -0.13V and +0.34 V respectively. What is anode and cathode for the galvanic cell?

a)

Anode: Pb2+, Cathode: Cu

b)

Anode: Pb, Cathode: Cu

c)

Anode: Pb, Cathode: Cu2+

d)

Anode: Pb, Cathode: Cu2+

14.

In the above Galvanic Cell, which half cell is undergoing reduction?

a)

Cu | Cu2+

b)

Zn | Zn2+

15.

What is the oxidation state of Pb in PbO ?

a)

+2

b)

+4

c)

0

d)

-2

16.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
17.

What is the oxidation state of Cl in ClO- ?

a)

0

b)

+1

c)

-1

d)

+2

18.
What is oxidation number of Cr in
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
19.

What is the reduction half-reaction for the following redox reaction?
                                           Zn + HgO ⟶\longrightarrow  ZnO + Hg

a)

Zn        ⟶\longrightarrow  Zn2+ 2e–

b)

Hg2+      +      2e–    ⟶\longrightarrow         Hg

c)

Zn    +    HgO

d)

ZnO     +     Hg

20.
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+
21.

What is the oxidation number of Mn in the following: MnO4-, MnO42- and MnO2?

a)

+4, +6, +7

b)

+7, +6, +4

c)

+2, +4, +7

d)

+5, +3, +4

22.
What is the function of Y in cell below?
a)
To complete the circuit
b)
To allow flow of electrons between both cells
c)
To allow flow of ions 
d)
To connect both half cells
23.
Which statement is correct when the cell produces electricity?
a)
Magnesium atoms lose electrons
b)
Mass of the iron electrode decreases.
c)
Electrons flow from the iron half-cell to the magnesium half-cell.
d)
Negative ion flow from magnesium half-cell to iron half-cell
24.
Below shows a cell diagram for voltaic cell. Which of the following is FALSE?
a)
Electrons flow from anode to cathode
b)
Oxidation happens in anode
c)
Copper undergo reduction to form copper ions
d)
Zinc undergo oxidation to form Zinc ions
25.

What reaction occurs at the anode?

Ag+/Ag = 0.80V

Ni2+/Ni = -0.25V

a)

Ag+ + e- →Ag

b)

Ag → Ag+ + e-

c)

Ni2+ + 2e- → Ni

d)

Ni → Ni2+ + 2e-

26.

What is the correct cell notation for the reaction below?

Cu2+ (aq) + Pb (s) → Cu (s) + Pb 2+ (aq)

a)

Pb| Pb2+ (aq) || Cu2+ (aq)|Cu

b)

Pb| Cu2+ (aq) || Pb2+ (aq)|Cu

c)

Cu| Cu2+ (aq) || Pb2+ (aq)|Pb

d)

Pb | Cu (s) || Pb 2+ (aq) | Cu2+

27.

Given the following cell notation

Al/Al3+ // Fe3+/ Fe

a)

Al is the cathode and Fe is the anode

b)

Fe is the cathode and Al is the anode

c)

Al is the anode and Al3+ is the cathode

d)

Fe is the cathode and Fe3+ is the anode

28.

Which is correct to write cell notation

Anode: Zn

Cathode: Ni

a)

Zn2+ (aq,1M) / Zn (s) // Ni (s) / Ni2+ (aq,1M)

b)

Zn (s) /Zn2+ (aq,1M) // Ni2+ (aq,1M) / Ni (s)

c)

Zn2+ (s,1M) / Zn (aq) // Ni (aq) / Ni2+ (s,1M)

d)

Zn (aq) /Zn2+ (s,1M) // Ni2+ (s,1M) / Ni (aq)

29.

Based on cell notation, write overall equation:


Al(s)/ Al3+(aq,1M) // Pb2+(aq, 1M)/ Pb(s)

a)

Pb(s) + Al3+(aq) ----------> Pb2+(aq) + Al(s)

b)

Pb2+(aq) + Al(s) ---------->Pb(s) + Al3+(aq)

c)

3Pb(s) + 2Al3+(aq) ----------> 3Pb2+(aq) + 2Al(s)

d)

3Pb2+(aq) + 2Al(s) ---------->3Pb(s) + 2Al3+(aq)

30.
This electrode loses mass 
a)
anode
b)
cathode

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