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Redox Reactions

Total questions: 45

Worksheet time: 3570secs

Name
Class
Date
1.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

2.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

3.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

4.

What is the oxidation number of iodine in KIO3?

a)

0

b)

-1

c)

+5

d)

+1

5.

Which of the following represents oxidation?

a)

C → CH4

b)

Fe3+ → Fe2+

c)

Cl2 → 2Cl-

d)

Zn → ZnO

6.
Which of the following represents reduction?
a)
C →  CO
b)
N2 →  NH3
c)
Zn  →   Zn2+ 
d)
H2 →  H2O
7.

In the reaction Zn + 2HCl --> ZnCl2 + H2

which element, if any, is oxidized?

a)

Zinc

b)

Hydrogen

c)

Chlorine

d)

None

8.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
9.
Which statement is true:
Mg → Mg2+ + 2e–
a)
Mg gains 2 electrons
b)
Mg2+ loses 2 electrons
c)
Mg loses 1 electron
d)
Mg loses 2 electrons
10.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
11.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
12.
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+
13.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
14.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
15.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
16.

Which of these metals is the least easily oxidized?

a)

Na

b)

Au

c)

Fe

d)

Ca

e)

Ag

17.

Of the following elements, ___________ is the most easily oxidized.

a)

oxygen

b)

fluorine

c)

nitrogen

d)

aluminum

e)

gold

18.

Which of the following reactions is a redox reaction?

a)

K2CrO4 + BaCl2 --> BaCrO4 + 2 KCl

b)

Pb2+ + 2 Br- --> PbBr

c)

Cu + S --> CuS

19.

What is the coefficient of the permanganate ion when the follow equation is balanced?


MnO4- + Br- --> Mn2+ + Br2 (acidic solution)

a)

1

b)

4

c)

3

d)

2

e)

5

20.

What is the coefficient of Fe3+ when the follow equation is balanced?


CN- + Fe3+ --> CNO- + Fe2+ (basic solution)

a)

1

b)

2

c)

3

d)

4

e)

5

21.

Which transormation could take place at the anode of an electrochemical cell?

a)

F2 to F-

b)

O2 to H2O

c)

Cr2O72- to Cr2+

d)

HAsO2 to As

e)

none of the above could take place at the anode

22.

Which one of the following is the best oxidizing agent?

a)

Ca

b)

Na

c)

O2

d)

H2

e)

Li

23.

Which of the following reactions will occur spontaneously as written?

a)

3 Sn4+ (aq) + 2 Cr (s) --> 2 Cr3+ (aq) + 3 Sn2+ (aq)

b)

Sn4+ (aq) + Fe3+ (aq) --> Sn2+ (aq) + Fe2+ (aq)

c)

Sn4+ (aq) + Fe2+ (aq) --> Sn2+ (aq) + Fe (s)

d)

3 Fe (s) + 2 Cr3+ (aq) --> 2 Cr (s) + 3 Fe2+ (aq)

24.

_______ is reduced in the following reaction:


Cr2O72- + 6 S2O32- + 14 H+ --> 2 Cr3+ + 3 S4O62- + 7 H2O

a)

S4O62-

b)

Cr6+

c)

H+

d)

S2+

e)

O2-

25.

_______ is the oxidizing agen in the following reaction:


Cr2O72- + 6 S2O32- + 14 H+ --> 2 Cr3+ + 3 S4O62- + 7 H2O

a)

S2O32-

b)

H+

c)

Cr3+

d)

S4O62-

e)

Cr2O72-

26.

What is the oxidation number of chromium in Cr2O72- ion?

a)

+3

b)

+14

c)

+12

d)

+6

e)

+7

27.

What is the oxidation number of oxygen in H2O2?

a)

+1

b)

+2

c)

-1/2

d)

-2

e)

-1

28.

The balanced half reaction in which the dichromate ion is reduced to chromium metal is a ________.

a)

6 electron

b)

12 electron

c)

four electron

d)

2 electron

e)

3 electron

29.

The standard cell potential for the voltaic cell based on the reaction below is __________ V.


Sn2+ (aq) + 2 Fe3+ (aq) --> 2 Fe2+ (aq) + Sn4+ (aq)

a)

-0.46

b)

+1.39

c)

+0.617

d)

+0.46

e)

+1.21

30.

The standard cell potential for the voltaic cell based on the reaction below is ______ V.


2 Cr (s) + 3 Fe2+ (aq) --> 3 Fe (s) + 2 Cr3+ (aq)

a)

+0.83

b)

+0.30

c)

+2.80

d)

+3.10

e)

-0.16

31.

In the galvanic cell using the redox reaction below, the reduction half-reaction is _______.


Zn(s) + Cu2+ (aq) --> Zn2+ (aq) + Cu (s)

a)

Cu2+ --> Cu + 2 e-

b)

Cu2++ 2 e- --> Cu

c)

Zn --> Zn2+ + 2 e-

d)

Zn + 2 e- --> Zn2+

32.

What is a voltmeter?

a)

The liquid part of the electrochemical cell

b)

The metal part of the electrochemical cell

c)

The part that measures the voltage in an electrochemical cell

33.

The standard redox potentials for a number of substances are shown below:


F2(g) + 2e-→ 2F-(aq); E0 = 2.87 V

O2(g)+ 4H+(aq)+ 4e-→ 2H2O(l); E0 = 1.23 V

Cu2+(aq) + 2e-→ Cu(s); E0 = 0.34 V

Fe2+(aq) + e- → Fe(s); E0 = -0.41V

2H2O(l) + 2e- → H2(g) + 2OH-(aq); E0 = -0.83 V

Mg2+(aq) + 2e- → Mg(s); E0 = -2.38 V


If all of these substances were available, what galvanic cell could be set up using these substances that would steadily deliver approximately 1.6 V?

a)

F2/F- and O2/H2O

b)

O2/H2O and Fe2+/Fe

c)

O2/H2O and Cu2+/Cu

d)

H2O/H2 and Mg2+/Mg

34.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

35.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

combustion

d)

oxidizing agent

36.

Substance that reduces another substance by losing electrons.

a)

reducing agent

b)

half-reaction

c)

electronegative atom

d)

oxidizing agent

37.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:


Consider the following REDOX reaction:

Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)

How many OH- molecules did you add to the reactant side of this reaction when balancing?

a)

1

b)

2

c)

3

d)

4

38.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Consider the following REDOX reaction:

Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)

Which species is the result of oxidation?

a)

Cl−

b)

ClO−

39.

What reaction occurs at the anode?

a)

Ag+ + e- →Ag

b)

Ag → Ag+ + e-

c)

Ni2+ + 2e- → Ni

d)

Ni → Ni2+ + 2e-

40.
Reduction happens at the 
a)
anode
b)
cathode
c)
salt bridge
d)
voltmeter
41.
What coefficient would Fe+2 have in the following reaction?
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
a)
1
b)
2
c)
3
d)
6
42.

Which energy conversion shown below takes place in a voltaic cell?

a)

Electrical to chemical

b)

Mechanical to chemical

c)

Mechanical to electrical

d)

Chemical to electrical

43.
In a voltaic cell the ions flow through the 
a)
wire
b)
salt bridge
44.
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
45.
Which of the following reactions is balanced by both mass and charge?
a)
Fe+2 + Al →Fe + Al+3
b)
Cu + Fe+2 → Cu+1 + Fe+3
c)
F2 + Br- --> F- + Br2
d)
Fe+2 + 2 Cu --> 2 Cu+ + Fe

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