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redox worksheet

Total questions: 35

Worksheet time: 56mins

Name
Class
Date
1.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

2.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

3.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

4.

What is the oxidation number of nitrogen in N2?

a)

-3

b)

0

c)

+4

d)

-1

5.

The sum of the oxidation numbers in SCN- is equivalent to

a)

0

b)

-1

c)

+1

d)

+3

6.

The sum of the oxidation numbers in Na2CO3 is equivalent to

a)

0

b)

-2

c)

+1

d)

-1

7.

What is the oxidation number of iodine in KIO3?

a)

0

b)

-1

c)

+5

d)

+1

8.

Determine the oxidation number of chromate in CrO42-.

a)

+6

b)

0

c)

+2

d)

+3

9.

Which of the following represents oxidation?

a)

C → CH4

b)

Fe3+ → Fe2+

c)

Cl2 → 2Cl-

d)

Zn → ZnO

10.
Which of the following represents reduction?
a)
C →  CO
b)
N2 →  NH3
c)
Zn  →   Zn2+ 
d)
H2 →  H2O
11.

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

which element, if any, is oxidized?

a)

Zinc

b)

Hydrogen

c)

Chlorine

d)

None

12.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
13.
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
14.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
15.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
16.
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+
17.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
18.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
19.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
20.
Is calcium oxidized or reduced in the following reaction? 
2 CaO--> 2 Ca + O2
a)
Oxidized
b)
Reduced
21.

Defined as the loss of electrons.

a)

oxidation

b)

reduction

c)

redox

d)

OIL RIG

22.

Defined as the gain of electrons.

a)

oxidation

b)

redox

c)

reduction

d)

LEO GER

23.

Cl2 + 2e- --> 2Cl - is an example of:

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

24.

An increase in oxidation number.

a)

more acidic

b)

reduction

c)

less basic

d)

oxidation

25.

A decrease in oxidation number.

a)

concentrated

b)

reduction

c)

oxidation

d)

dilute

26.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

27.

What is the reducing agent here: N2 + 3H2 --> 2NH3

a)

N2

b)

H2

c)

NH3

d)

2NH3

28.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
29.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
30.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
31.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
32.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
33.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
34.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
35.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1

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