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Redox Reactions

Total questions: 50

Worksheet time: 1hrs 8mins

Name
Class
Date
1.

What is the oxidation state of Cl in ClO- ?

a)

0

b)

+1

c)

-1

d)

+2

2.

What is the oxidation state of Cu in Cu2+?

a)

-1

b)

-2

c)

+2

d)

0

3.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

4.

What is the oxidation state of Pb in PbO ?

a)

+2

b)

+4

c)

0

d)

-2

5.

C in CO32-?

a)

-4

b)

+2

c)

0

d)

+4

6.

S in HSO4- ?

a)

+5

b)

-6

c)

+6

d)

+2

7.

H in NaH ?

a)

+1

b)

0

c)

-1

d)

None of the above

8.

Is this oxidation or reduction: SO42- becomes SO2

a)

Oxidation

b)

Reduction

c)

Neither

d)

Both

9.

What type of reaction is this: C2H2 becomes C2H6

a)

Reduction

b)

Oxidation

c)

Neither

d)

Combustion

10.

What type of reaction is this: SF4 becomes SF6

a)

Hydrogenation

b)

Reduction

c)

Oxidation

d)

None of the above

11.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
12.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

13.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

14.

Gaining hydrogen is an example of...

a)

oxidation

b)

reduction

15.

Gaining oxygen is an example of...

a)

oxidation

b)

reduction

16.

In a redox reaction, the species reduced

a)

gains electrons and is the oxidizing agent

b)

loses electrons and is the oxidizing agent

c)

loses electrons and is the reducing agent

d)

gains electrons and is the reducing agent

17.
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
18.
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+
19.

In a reaction, copper is reduced; its number of electrons has:

a)

Increased

b)

Decreased

c)

Remained Constant

d)

Varies Randomly

20.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
21.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
22.

In a redox reaction, spectator ions...

a)

become oxidised

b)

become reduced

c)

remain unchanged

23.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
24.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
25.
A chemical reaction that involves a gain/loss of electrons is called:
a)
Double Replacement
b)
Neutralization
c)
Oxidation-Reduction
d)
Hydrolysis
26.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
27.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
28.
What element's don't have oxidation numbers?
a)
alkali metals
b)
noble gases
c)
halogens
d)
alkaline earth metals
29.

When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is

a)

a reducing agent

b)

an oxidizing agent

c)

a combustible gas

d)

a diffusible gas

30.

In the reaction, Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

a)

carbon monoxide is reduced

b)

carbon monoxide is the oxidising agent

c)

iron(III) oxide is oxidised

d)

iron(III) oxide is the oxidising agent

31.

Name the oxidising agent in the following reaction:

nitrogen + hydrogen -> ammonia

a)

nitrogen

b)

hydrogen

c)

ammonia

32.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
33.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
34.

What is the oxidation number of iodine in KIO3?

a)

5

b)

1

c)

0

d)

-1

35.

Determine the oxidation number of chromium in CrO42-.

a)

5

b)

6

c)

4

d)

2

36.

A decrease in oxidation number.

a)

Oxidation

b)

combination

c)

reduction

37.

Which statement is true:

Mg → Mg2+ + 2e–

a)

Mg gains 2 electrons

b)

Mg2+ loses 2 electron

c)

Mg loses 1 electron

d)

Mg loses 2 electrons

38.

Substance that oxidizes another substance by accepting its electrons.

a)

oxidising agent

b)

reducing agent

c)

combustion

39.

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?

a)

Cu --> Cu+2

b)

Cu + 2 e- --> Cu+2

c)

Cu - 2e- --> Cu+2

d)

Cu --> Cu+2 + 2 e-

40.

In a redox reaction, the species reduced

a)

gains electrons and is the oxidizing agent

b)

loses electrons and is the oxidizing agent

c)

gains electrons and is the reducing agen

d)

loses electrons and is the reducing agent

41.

Substance that oxidizes another substance by accepting its electrons.

a)

oxidation number

b)

reducing agent

c)

oxidizing agent

42.

What is happening to the chemical in bold?

Aluminium oxide --> aluminium + oxygen

a)

Oxidation

b)

Reduction

43.

What is happening to the chemical in bold?

Nickel + oxygen --> nickel oxide

a)

Oxidation

b)

Reduction

44.

What is happening to the chemical in bold?

Carbon + zinc oxide --> carbon dioxide + zinc

a)

Oxidation

b)

Reduction

45.

What is happening to the chemical in bold?

Iron oxide + hydrogen --> iron + water

a)

Oxidation

b)

Reduction

46.

What is happening to the chemical in bold?

Aluminium + chromium oxide --> aluminium oxide + chromium

a)

Oxidation

b)

Reduction

47.

What is happening to the chemical in bold?

Aluminium + oxygen --> aluminium oxide

a)

Oxidation

b)

Reduction

48.

What is happening to the chemical in bold?

Magnesium + iron oxide --> magnesium oxide + iron

a)

Oxidation

b)

Reduction

49.
Which change does nitrogen undergo oxidation?
a)
A
b)
B
c)
C
d)
D
50.
Which are examples of reduction?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III

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