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Part 1 - TEST - REDOX Reactions

Total questions: 50

Worksheet time: 3hrs 41mins

Name
Class
Date
1.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
2.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
3.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
4.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
5.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
6.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
7.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
8.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
9.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
10.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
11.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
12.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
13.

A redox reaction is NOT:

a)

all reactions

b)

a combustion reaction

c)

a reduction-oxidation reaction

d)

a reaction in which electrons are transferred from one atom to another

14.

Defined as the loss of electrons.

a)

oxidation

b)

reduction

c)

redox

d)

OIL RIG

15.

Defined as the gain of electrons.

a)

oxidation

b)

redox

c)

reduction

d)

LEO GER

16.

What is the oxidation number of C in SrCO3?

a)

-4

b)

+2

c)

-6

d)

+4

17.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

combustion

d)

oxidizing agent

18.

Substance that reduces another substance by losing electrons.

a)

reducing agent

b)

half-reaction

c)

electronegative atom

d)

oxidizing agent

19.

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

a)

N2

b)

H2

c)

NH3

d)

2NH3

20.

The ionic equation shows the reaction between zinc (Zn) and hydrochloric acid.

Zn + 2H+ -> Zn2+ + H2

What change takes place in the zinc?

a)

It gains electrons

b)

Its oxidation state increases

c)

It is reduced

d)

It gains hydrogen

21.

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

22.

State the reducing agent in this reaction.

Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2

a)

Cu

b)

HNO3

c)

Cu(NO3)2

d)

NO2

23.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
24.

Mg + PbCl2 --> MgCl2 + Pb. Which statement correctly describes the oxidation and reduction that occur?

a)

Mg is oxidized and Cl- is reduced

b)

Mg is oxidized and Pb+2 is reduced

c)

Mg is reduced and Cl- is oxidized

d)

Mg is reduced and Pb+2 is oxidized

25.

In the reaction Zn + H2O --> ZnO2 + H2

which element, if any, is oxidized?

a)

Zn0

b)

Zn+2

c)

O-2

d)

H20

e)

None

26.

The ionic equation shows the reaction between zinc (Zn) and hydrochloric acid.

Zn + 2H+ -> Zn2+ + H2

What change takes place in the zinc?

a)

It gains electrons

b)

Its oxidation state increases

c)

It is reduced

d)

It gains hydrogen

27.

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

28.

State the reducing agent in this reaction.

Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2

a)

Cu

b)

HNO3

c)

Cu(NO3)2

d)

NO2

29.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
30.

What element is being Oxidized?

a)

N+5

b)

H+1

c)

O-2

d)

S-2

31.

Oxidation-reduction reactions occur because of the competition between particles for...

a)

protons

b)

neutrons

c)

electrons

d)

positrons

32.

Mg + PbCl2 --> MgCl2 + Pb. Which statement correctly describes the oxidation and reduction that occur?

a)

Mg is oxidized and Cl- is reduced

b)

Mg is oxidized and Pb+2 is reduced

c)

Mg is reduced and Cl- is oxidized

d)

Mg is reduced and Pb+2 is oxidized

33.

In redox reactions, what happens to the reducing agent?

a)

It is oxidised

b)

It does not participate in the reaction and remains unchanged

c)

It is reduced

34.

For the following example, identify the oxidizing agent: Na+1 + Cl-1 --> NaCl

a)

Na+1

b)

Cl-1

c)

Both

35.

For the following example, identify the reducing agent: Al+3 + P-3 --> AlP

a)

Al+3

b)

P-3

c)

Both

36.

For the following example, identify the reducing agent:

H2 + Cl2 --> 2HCl

a)

H2

b)

Cl2

c)

Both

37.

What is the oxidizing agent of this reaction?

3Mg + N2−−−−> Mg3N2

a)

Mg

b)

N2

c)

Mg3N2

d)

MgN

38.

What is the reducing agent of this reaction?

2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)

a)

H+

b)

Al3+

c)

Al

d)

H2

39.

Which statement is true of a reducing agent?

a)

It is oxidised as it gains electrons.

b)

It is oxidised as it loses electrons.

c)

It is reduced as it gains electrons.

d)

It is reduced as it loses electrons.

40.

What is the reducing agent of this reaction?

2Al (s) + 6H+ (aq) → 2Al3+ (aq) + 3H2 (g)

a)

H+

b)

Al3+

c)

Al

d)

H2

41.

What is the oxidation number of X in XO4-?

a)

+4

b)

+5

c)

+7

d)

+8

42.

Which equation represents a redox reaction?

a)

NaOH + HNO3 → NaNO3 +H2O

b)

2AgNO3 + Zn → Zn(NO3)2 + 2Ag

c)

2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3

d)

CaCO3 + 2HCl → CaCl2 + H2O + CO2

43.

Consider the following reaction.

NO3− (aq) + Cu (s) → NO (g) + Cu2+ (aq)

Which statement is correct?

a)

Cu (s) is the reducing agent because it loses electrons.

b)

Cu (s) is the reducing agent because it gains electrons.

c)

Cu (s) is the oxidizing agent because it loses electrons.

d)

Cu (s) is the oxidizing agent because it gains electrons.

44.

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

45.

What is the oxidizing agent in the following reaction?

Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s)

a)

Zn (s)

b)

Cu2+ (aq)

c)

Zn2+ (aq)

d)

Cu (s)

46.

Al (s) + FeSO4 (aq) → Al2(SO4)3 (aq) + Fe (s)

Which statement/s is/are true about this reaction?

I. Al (s) reduces Fe2+ (aq)

II. Al (s) is the oxidizing agent.

III. FeSO4 is the reducing agent.

a)

I and II only

b)

I and III only

c)

I only

d)

I, II and III

47.

Which statement is NOT true when the following redox reaction is balanced?

Cu (s) + NO3- (aq) → NO (g) + Cu2+ (aq) [acidic]

a)

There are 8H+ (aq) in the reactant side.

b)

There are 2H2O (l) in the product side.

c)

There are 4H2O (l) in the product side.

d)

There are 6e- in both half-equations.

48.

Which of the following represents oxidation?

a)

C → CH4

b)

Fe3+ → Fe2+

c)

Cl2 → 2Cl-

d)

Zn → ZnO

49.
What is oxidation number of H in CaH2?
a)
+1
b)
-1
c)
0
d)
+2
50.
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+

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