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Worksheets

Revision Redox aftermidterm M5

Total questions: 192

Worksheet time: 4hrs 55mins

Name
Class
Date
1.

Which formula describes correctly potassium iodide?

a)

PIPI  

b)

PI2PI_2  

c)

KIKI  

d)

KI2KI_2  

2.

a)

A

b)

B

c)

C

d)

D

3.

What is Oxidation?

a)

A reduction reaction where a metal loses oxygen

b)

A redox reaction where a metal loses oxygen

c)

A reduction reaction where a metal gains oxygen

d)

A redox reaction where a metal gains oxygen

4.

Which factors increase the rate of a reaction?

a)

increasing temperature

b)

increasing concentration

c)

increasing total surface area

d)

All of these

5.

Which reaction does not show a redox reaction?

a)

2KBr + F2 → 2KF + Br2

b)

C2H4 + H2 → C2H6

c)

Na2O + 2HCl → 2NaCl + H2O

d)

H2SO4 + Mg → MgSO4 + H2

6.

Ali has an iron ring. He wants to make the ring more beautiful and durable to give his friends as a present. What is the best way to do it?

Ali mempunyai sebentuk cincin besi. Dia ingin menjadikan cincin itu lebih cantik dan tahan lama untuk dihadiahkan kepada rakannya. Apakah langkah yang paling baik dilakukan?

a)

Dip the ring in acid

Mencelup cincin dalam acid

b)

Wash the ring with detergent

Mencuci cincin dengan detegen

c)

Plate the ring with silver

Menyadur cincin dengan argentum

d)

Brush the ring with glossy material

Memberus cincin dengan bahan pengilat

7.

Sodium hydroxide reacts with Sulfuric Acid to make what?

a)

Sulfuric Hydroxide

b)

Sodium Sulfate

c)

Sodium Hydroxide

d)

Sulfuric Sodium

8.

What is characteristic to ionic compounds?

a)

Low melting and boiling points

b)

High melting and boiling points

c)

Softness

d)

Electrical conductivity in solid state

9.

In the reactions


Sn+2 + 2Fe+3 → Sn+4 + 2Fe+2


the oxidizing agent is

a)

Sn+4

b)

Sn+2

c)

Fe+3

d)

Fe+2

10.

Choose all the statements which are correct for an oxidising agent.

HINT: (More than one answer)

a)

removes hydrogen

b)

gains oxygen

c)

is reduced at the end of the reaction

d)

accepts electrons

11.

Which are examples of reduction?

a)

I and II

b)

I and III

c)

II and III

d)

I, II and III

12.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

combustion

d)

oxidizing agent

13.

Defined as the loss of electrons.

a)

oxidation

b)

reduction

c)

redox

d)

OIL RIG

14.

In a redox reaction, the oxidizing agent

a)

gains electrons and is oxidized

b)

loses electrons and is oxidized

c)

loses electrons and is reduced

d)

gains electrons and is reduced

15.
A chemical reaction that involves a gain/loss of electrons is called:
a)
Double Replacement
b)
Neutralization
c)
Oxidation-Reduction
d)
Hydrolysis
16.
Which of the following compounds is NOT an ionic compound?
a)
NaCl
b)
NH3
c)
Fe2O3
d)
HCl
17.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
18.
What element's don't have oxidation numbers?
a)
alkali metals
b)
noble gases
c)
halogens
d)
alkaline earth metals
19.
What is oxidation number of Mn in MnO2 ?
a)
0
b)
+2
c)
-2
d)
+4
20.
What is the oxidation number of Ca in Ca3N2?
a)
+3
b)
+2
c)
-3
d)
-2
21.
What is oxidation number of Cr in
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
22.
What is oxidation number of P in K3PO4?
a)
+1
b)
+5
c)
-2
d)
0
23.
What are oxidation numbers?
a)
Number of electrons in the outer most energy level
b)
Number of protons
c)
Electrons gained or lost in chemical bonding
d)
Number of neutrons gained or lost
24.
What are valence electrons?
a)
Number of electrons in the outer most energy level
b)
Number of electrons gained or lost
c)
Number of electrons in the inner energy level
d)
Number of electrons 
25.

What is the oxidation state of Cl in ClO- ?

a)

0

b)

+1

c)

-1

d)

+2

26.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

27.

What is the oxidation state of Pb in PbO ?

a)

+2

b)

+4

c)

0

d)

-2

28.

C in CO32-?

a)

-4

b)

+2

c)

0

d)

+4

29.

S in HSO4- ?

a)

+5

b)

-6

c)

+6

d)

+2

30.

H in NaH ?

a)

+1

b)

0

c)

-1

d)

None of the above

31.

How many valence electrons do elements in Group 15 have?

a)

15

b)

5

c)

4

32.

How many electrons are required to fill the outer shell for elements in Group 15

a)

15

b)

3

c)

5

33.

How many valence electrons do elements in Group 13 have?

a)

13

b)

5

c)

3

34.

How many valence electrons do elements in Group 1 have?

a)

7

b)

10

c)

1

35.

How many valence electrons are required to fill the outer shell for elements in Group 17?

a)

17

b)

1

c)

7

36.

How many valence electrons do most elements in Group 18 have?

a)

18

b)

8

c)

2

37.

What is the charge, or oxidation number, for elements in Group 17?

a)

+ 1

b)

-7

c)

-1

38.

What is the charge, or oxidation number, for elements in Group 2?

a)

-2

b)

+2

c)

-3

39.

What is the charge, or oxidation number, for elements in Group 13?

a)

+ 3

b)

-5

c)

+13

40.

What is the charge, or oxidation number, for elements in Group 14?

a)

14

b)

+4/-4

c)

-16

41.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
42.
What is the oxidation number of O in CO2?
a)
+2
b)
-1
c)
+4
d)
-2
43.
What is the oxidation number of N in NO21- ?
a)
-3
b)
+4
c)
-2
d)
+3
44.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
45.
Which of the following compounds is NOT an ionic compound?
a)
NaCl
b)
NH3
c)
Fe2O3
d)
HCl
46.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
47.
What is the oxidation number of Ca in Ca3N2?
a)
+3
b)
+2
c)
-3
d)
-2
48.
What is the oxidation number of S in SO4 2-  ?
a)
-2
b)
+2
c)
+6
d)
-4
49.
What is oxidation number of Cr in
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
50.
What is oxidation number of P in K3PO4?
a)
+1
b)
+5
c)
-2
d)
0
51.

S in HSO4- ?

a)

+5

b)

-6

c)

+6

d)

+2

52.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
53.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
54.
A chemical reaction that involves a gain/loss of electrons is called:
a)
Double Replacement
b)
Neutralization
c)
Oxidation-Reduction
d)
Hydrolysis
55.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
56.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
57.

Calcium has an oxidation number of +1 only. ( True/False )

a)

True

b)

False

58.

In the following compound, KMnO4, the oxidation number for manganese is 7+. ( True/False )

a)

True

b)

False

59.

The oxidation number of a free element is zero. ( True/False )

a)

True

b)

False

60.

Choose the oxidation number of N in NO.

a)

-1

b)

+1

c)

-2

d)

+2

61.

What are the two ions of iron?

a)

Fe2+, Fe3+

b)

Fe+, Fe2+

c)

Fe2+, Fe4+

62.

What are the two ions of copper?

a)

Cu2+, Cu3+

b)

Cu+, Cu2+

c)

Cu2+, `Cu4+

63.

What are the two ions of lead?

a)

Pb2+, Pb3+

b)

Pb+, Pb2+

c)

Pb2+, Pb4+

64.

Choose the oxidation number for the element zinc

a)

one

b)

two

c)

zero

d)

three

65.

Choose the oxidation number for the element zinc

a)

one

b)

two

c)

zero

d)

three

66.

What are the oxidation states of nitrogen in the compounds NO, NO2, N2O3, N2O4 and N2O5 respectively?

a)

+1, +2, +3, +4, +5

b)

+2, +4, +3, +8, +5

c)

+2, +4, +3, +4, +5

d)

+2, +2, +6, +4, +5

e)

+1, +4, +3, +8, +5

67.

Choose the oxidation number of H in HCl.

a)

+1

b)

-1

c)

+2

d)

-2

68.

Identify the oxidation number of iodine in IO3-

a)

+5

b)

+2

c)

+6

d)

+7

69.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

70.

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

a)

31

b)

5

c)

15

d)

4

71.
How many valence electrons are found in atoms of group 1?
a)
7
b)
6
c)
4
d)
1
72.
How many valence electrons are found in atoms of group 14?
a)
4
b)
3
c)
14
d)
16
73.
This could be the dot diagram of 
a)
Ne
b)
Si
c)
Al
d)
Be
74.

This could be the dot diagram of

a)

Mg

b)

Cl

c)

C

d)

O

75.

How many valence electrons does Germanium (Ge) have?

a)

32

b)

4

c)

14

d)

2

76.

How many valence electrons does Selenium (Se) have?

a)

6

b)

16

c)

79

d)

34

77.

Which of the following is a correct electron dot structure?

a)
b)
c)
d)
78.

Which of the following is the correct electron dot structure for nitrogen?

a)
b)
c)
d)
79.
What is the charge for an ion in group 1?
a)
+1
b)
-7
c)
-1
d)
+7
80.
What is the charge of an ion in group 2?
a)
+2
b)
-6
c)
-2
d)
+6
81.
What is the charge of an ion in group 3?
a)
+3
b)
-3
c)
-5
d)
+5
82.
What is the charge of an ion in group 5?
a)
+5
b)
-5
c)
+3
d)
-3
83.
What is the charge of an ion in group 6?
a)
-6
b)
+6
c)
-2
d)
+2
84.
What is the charge of an ion in group 7?
a)
+7
b)
-7
c)
+1
d)
-1
85.
What is the charge of the mercury(II) ion?
a)
+11
b)
+2
c)
-2
d)
-11
86.
What is the charge of the cobalt(IV) ion?
a)
+4
b)
-4
c)
+6
d)
+5
87.
What is the charge of the iron(III) ion?
a)
+3
b)
-3
c)
+2
d)
+1
88.
What is the charge of the yttrium(III) ion?
a)
+3
b)
-3
c)
+5
d)
-5
89.
What is oxidation number of Na in Na+ ?
a)
0
b)
+1/2
c)
+1
d)
-1
90.
What element's don't have oxidation numbers?
a)
alkali metals
b)
noble gases
c)
halogens
d)
alkaline earth metals
91.
What is the oxidation number of Magnesium (Mg)?
a)
+2
b)
-2
c)
whats an oxidation number
92.
What is the oxidation number for Flourine (F)?
a)
+1 
b)
-1
c)
17
d)
7
93.
Which of the following elements does NOT have an oxidation number of +2?
a)
Ca
b)
Sr
c)
K
d)
Ba
94.
What element always has an oxidation number of +1?
a)
Hydrogen
b)
Fluorine
c)
Chlorine
d)
Iodine
95.
What is the oxidation number for Be? 
a)
+1
b)
+2
c)
+3
d)
+4
96.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
97.
What element is being Reduced?
a)
N
b)
H
c)
O
d)
S
98.
What are the coefficients when the equation is balanced?
a)
2 + 3 --> 2 + 3 + 4
b)
1 + 3 --> 1 + 3 + 2
c)
2 + 4 --> 2 + 3 + 2
d)
1 + 1 --> 1 + 1 + 1
99.
What element is being Oxidized?
a)
I
b)
H
c)
S
d)
O
100.
What are the coefficients when the equation is balanced?
a)
1 + 1 + 1 --> 2 + 1 + 3
b)
2 + 2 + 2 --> 4 + 2 + 3
c)
1 + 2 + 1 --> 2 + 2 + 3
d)
1 + 1 + 1 --> 1 + 1 + 1
101.
What element is being reduced?
a)

I

b)

H

c)

S

d)

O

102.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
103.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
104.
What is oxidation number of H in CaH2?
a)
+1
b)
-1
c)
0
d)
+2
105.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
106.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
107.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
108.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
109.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
110.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
111.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
112.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
113.
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
a)
Iron
b)
Fluorine
c)
Oxygen
114.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
115.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
116.

During the process of reduction, _________________

a)

protons are lost.

b)

protons are gained.

c)

electrons are lost.

d)

electrons are gained

e)

neutrons are lost.

117.

The change of I‾ to I2 is ________________

a)

oxidation

b)

reduction

c)

neutralization

d)

Decomposition

e)

Combustion

118.

What is the oxidation number of Nitrogen in HNO3

a)

-7

b)

-5

c)

+5

d)

+7

e)

+2

119.

Find the oxidation number of S in S2O4 2-

a)

+3

b)

+6

c)

-6

d)

-3

e)

-4

120.

Determine the oxidation number of the selected element in each ion/ compound.

a) N in N2O4

b) Cr in CrO4 2-

c) I in IO3-

a)

+8, -6, +5

b)

+2, +8, +6

c)

+4, +6, +5

d)

-4, -6, -5

e)

-4, -8, -6

121.

Identify the species reduced in the following reaction.


Fe(s) + 2 Ag+(aq) → Fe2+(aq) + 2 Ag(s)

a)

Fe

b)

Ag

c)

none of these

d)

None of the above

122.

The below reaction is an example of _________reaction.

F2 → 2 F- + 2 e-

a)

Oxidation

b)

Reduction

c)

Neutralization

d)

decomposition

e)

combustion

123.

What is the oxidation number of: Br2?

a)

-1

b)

+1

c)

-2

d)

0

124.

What is the oxidation number of Sr+2?

a)

-2

b)

0

c)

+2

d)

+1

125.

Which of the following would be considered oxidized in the following reaction:
2 Li + ZnCl2→ 2 LiCl + Zn2\ Li\ +\ ZnCl_{2_{ }}\rightarrow\ 2\ LiCl\ +\ Zn   

a)

Li

b)

Zn

c)

Cl

d)

None of the elements were oxidized

126.

Combustion and single-replacement reactions are __________ redox reactions.

a)

always

b)

never

c)

sometimes

d)

mostly

127.

_____________ synthesis and decomposition reactions involve the transfer of electrons.

a)

All

b)

Most

c)

No

d)

Some

128.

Defined as the loss of electrons.

a)

oxidation

b)

reduction

c)

redox

d)

OIL RIG

129.

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

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

130.

These keep track of the movement of electrons.

a)

(+) and (-) signs

b)

oxidation numbers

c)

coefficients

d)

subscripts

131.

Substance that oxidizes another substance by accepting its electrons.

a)

reducing agent

b)

oxidation number

c)

combustion

d)

oxidizing agent

132.

What is a half-reaction of this equation, Na + Cl --> NaCl ?

a)

Cl + e- --> Cl-

b)

Cl - e- --> Cl-

c)

Na --> Na + e-

d)

Na° + Cl°--> Na+1Cl-1

133.

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

a)

N2

b)

H2

c)

NH3

d)

2NH3

134.

Which one of the following conversions is an example of reduction?

a)

Copper (II) oxide to copper (II) sulfate

b)

Copper (II) oxide to copper

c)

Hydrochloric acid to chlorine

d)

Lead (II) nitrate to lead (II) chloride

135.

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

136.

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

137.

Choose all the statements which are correct for an oxidising agent.

a)

removes hydrogen

b)

gains oxygen

c)

is reduced at the end of the reaction

d)

accepts electrons

138.

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

139.

Name the oxidising agent in the following reaction:

nitrogen + hydrogen -> ammonia

a)

nitrogen

b)

hydrogen

c)

ammonia

140.

State the reducing agent in this reaction.

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

a)

Cu

b)

HNO3

c)

Cu(NO3)2

d)

NO2

141.

Which one below is redox reaction?

a)

CaCO3+2HCl⟶CaCl2+CO2+H2OCaCO_3+2HCl\longrightarrow CaCl_2+CO_2+H_2O

b)

CaO+H2O⟶Ca(OH)2CaO+H_2O\longrightarrow Ca\left(OH\right)_2

c)

SO2+2H2S⟶3S+2H2OSO_2+2H_2S\longrightarrow3S+2H_2O

d)

NaCl+AgNO3⟶AgCl+NaNO3NaCl+AgNO_3\longrightarrow AgCl+NaNO_3

142.

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

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

143.

A decrease in oxidation number.

a)

concentrated

b)

reduction

c)

oxidation

d)

dilute

144.

An increase in oxidation number.

a)

more acidic

b)

reduction

c)

less basic

d)

oxidation

145.

What is a half-reaction of this equation, Na + Cl --> NaCl ?

a)

Cl + e- --> Cl-

b)

Cl - e- --> Cl-

c)

Na --> Na + e-

d)

Na° + Cl°--> Na+1Cl-1

146.
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
147.
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+
148.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
149.
What is the reducing agent of this reaction?
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
a)
H+
b)
Al3+
c)
Al
d)
H2
150.
What is the oxidizing agent of this reaction?
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
a)
H2
b)
Al3+
c)
Al
d)
H+
151.
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
152.

What is a correct half reaction for the following reaction:

3 Ca + N2 ----> Ca3N2

a)

Ca + 3 e- ----> Ca+3

b)

Ca ----> Ca+2 + 2 e-

c)

Ca + 2 e- ----> Ca+2

d)

Ca+2 + 2 e- ----> Ca

153.

What is a correct half reaction for the following reaction:

2 Al + N2 ----> 2 AlN

a)

Al + 3 e- ----> Al+3

b)

N ----> N+2 + 2 e-

c)

Al+3 + 3 e- ----> Al

d)

N + 3 e- ----> N-3

154.

What is oxidation?

a)

A reaction involving oxygen

b)

A reaction involving non-metals

155.
Is this an example of oxidation?
a)
Yes
b)
No
156.
Which of the following statement is WRONG?
a)

The process of losing the electron is called Oxidation

b)

An Oxidizing agent is the one that losing the electron

c)

The process of receiving the electron is called Reduction

157.
Is the following equation an example of oxidation?
Cu + O2 ---> 2 CuO
a)
Yes
b)
No
158.
Is the following equation an example of oxidation?
Na + Cl ----> NaCl
a)
Yes
b)
No
159.
What is corrosion?
a)
The release of oxygen
b)
Breakdown of a metal
160.
Is this an example of corrosion?
a)
Yes
b)
No
161.

Name the two general classifications of corrosion.

a)

Direct chemical attack and Electrochemical attack.

b)

Fretting corrosion and Galvanic attack.

162.

Rusting is a _____________ process.

a)

Mechanical

b)

Chemical

c)

Physical

163.

Rusting is a special term, given to the corrosion metal is... .

a)

Au

b)

Pt

c)

Fe

d)

Ag

164.

What two things cause Iron to Rust ?

a)

Air and Oxygen

b)

Oxygen and Water

c)

Water and Carbon dioxide

d)

Carbon dioxide and Air

165.

What is the chemical name given to Rust ?

a)

Iron dioxide

b)

Steel oxide

c)

Iron oxide

d)

Carbon dioxide

166.

Rusting can be prevented by

a)

Alloying

b)

Painting

c)

Covering with other fast reactive metal

d)

All of above

167.

two types of Noble metals

a)

gold and platinum

b)

iron and copper

c)

stainless steel and aluminum

d)

tin and brass

168.
Which of the following metals is very unreactive and unlikely to corrode. 
a)
Copper
b)
Gold
c)
sodium
d)
Potassium
169.

Hydrocarbon fuel + oxygen ----> ___+____

(Select 2)

a)

CO2

b)

O2

c)

H2O

d)

C2H4

170.

What conditions are required for rusting?

a)

water only

b)

oxygen only

c)

water and oxygen

171.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

172.

What is the chemical nature of rust?

a)

iron (II) oxide

b)

hydrated iron (II) oxide

c)

iron (III) oxide

d)

hydrated iron(III) oxide

173.

The following metals would protect iron by electrons flowing to the iron is ... .

a)

Silver

b)

Gold

c)

Copper

d)

Magnesium

174.

For explaining dry corrosion of iron metal, which one of the following is necessary?

a)

Chlorine

b)

Hydrogen

c)

Oxygen

d)

sulphur

175.

Which of the following is an example of corrosion?

a)

Rusting of iron

b)

Tarnishing of silver

c)

Both

d)

None

176.

Corrosion is an example of

a)

Oxidation

b)

Erosion

c)

Electrolysis

d)

Reduction

177.

Which of the following is / are examples of sacrificial protection against rusting?

a)

Iron object coated with tin

b)

Underground iron pipes connected to magnesium bars

c)

Iron railings coated with paint

178.

Which of the following is / are examples of sacrificial protection against rusting?

(1) Iron object coated with tin

(2) Underground iron pipes connected to magnesium bars

(3) Iron railings coated with paint

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

179.
Iron rust in the presence of:
a)
Vacuum
b)
Moisture
c)
Oxygen
d)
Moisture and Oxygen
180.

Corrosion of metals is fairly high in one of the following mediums.

a)

Acidic

b)

Alkaline

c)

Neutral

d)

Nonaqueous

181.

Metals do not exist in nature in the form of ___________.

a)

Nitrates

b)

Sulphates

c)

Carbonates

d)

Oxides

182.

Due to corrosion, useful properties of metals such as malleability, ductility and electrical conductivity are lost.

a)

Yes

b)

No

183.
Which of the following is NOT a harmful effect of corrosion?
a)
Bad appearance
b)
Maintenance cost
c)
Clean product
d)
Plant shutdown
184.

Steel is ... than iron

a)

stronger

b)

weaker

185.

Steel which doesn't rust is called...

a)

stainless steel

b)

rust-free steel

186.

All alloys are mixtures.

a)

True

b)

False

187.

Rusting can be prevented by?

a)

Removing paint

b)

Adding water

c)

keeping air (oxygen) away

d)

All of the above

188.

A use of pure iron is ...

a)

There are very few uses

b)

Car bodies

c)

Construction

d)

Cutlery

189.

What do metals conduct well?

a)

heat

b)

electricity

c)

circulation

d)

music

190.

All metal elements melt at the same boiling point.

a)

True

b)

False

191.

What can act as an insulator, preventing the movement, of electricity?

a)

glass

b)

wood

c)

rubber

d)

copper

192.
a brittle material is one that
a)
will bend
b)
fractures under presure
c)
can be crushed easilly

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