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ELECTROCHEMISTRY AND CORROSION

Total questions: 62

Worksheet time: 54mins

Name
Class
Date
1.

Electrochemistry is

a)

Study of electron in atom

b)

Study of electricity in molecules

c)

The relationship between chemical reactions and electricity

d)

the study of electrons moving from one a tom to another

2.

An oxidizing agent will

a)

increase in mass

b)

lose electrons

c)

be reduced

d)

increase in oxidation number

3.

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

a)

electrons

b)

positrons

c)

protons

d)

neutrons

4.

Galvanic cells convert

a)

mechanical energy in to electrical energy

b)

potential energy in to electrical energy

c)

electrical energy in to chemical energy

d)

chemical energy in to electrical energy

5.

An electrolytic cell uses electrical energy to drive

a)

chemical reaction

b)

physical reaction

c)

no reaction

d)

none of above

6.
What unit of measurement do we use to measure electrical potential?
a)
Watts
b)
Volts
c)
Amps
d)
Ohms
7.

Applications of Kohlrausch’s law

a)

Determination of Dissociation constant

b)

Degree of dissociation

c)

Solubility of sparingly soluble salts

d)

All the above

8.

EO represents

a)

Single electrode potential

b)

Standard electrode potential

c)

Standard hydrogen electrode

d)

None

9.

In electrochemical cell, oxidation takes place at

a)

Right

b)

Left

c)

Top

d)

Bottom

10.

In electrochemical cell, reduction takes place at

a)

Right

b)

Left

c)

Top

d)

Bottom

11.

cathode is the electrode where

a)

reduction takes place

b)

oxidation takes place

c)

either reduction or oxidation

d)

none of these

12.
Which energy conversion shown below takes place in an electrochemical cell?
a)
Electrical to chemical
b)
Mechanical to chemical
c)
Mechanical to electrical
d)
Chemical to electrical
13.
Oxidation happens at the
a)
Anode
b)
Cathode
c)
Salt bridge
d)
Voltmeter
14.
If the cell potential is negative, the reaction is?
a)
 a success
b)
spontaneous
c)
not spontaneous
15.
What does the double line mean?
Zn/Zn+2 // Cu+2/Cu
a)
anode
b)
cathode
c)
salt bridge
d)
substance in contact
16.

Electrochemistry deals with

a)

electric energy

b)

chemical energy

c)

only a

d)

both a & b

17.

Electronic conduction is due to flow of

a)

Protons

b)

Electrons

c)

Neutrons

d)

Ions

18.

Which of the following statement is false

a)

flow of ions takes place in both direction

b)

conductivity of electrolyte is generally low

c)

electrolysis involves physical changes

d)

flow of electrons is unidirectional

19.

A chemical species in an electrochemical reaction that LOSSES electrons undergoes _________.

a)

Oxidation Reaction

b)

Reduction Reaction

20.

In a galvanic cell, it is an electrode where the oxidation happens?

a)

Cathode Electrode

b)

Anode Electrode

21.
Reduction happens at the 
a)
Spa
b)
Cathode
c)
Salt bridge
d)
Anode
22.
Oxidation happens at the
a)
Anode
b)
Cathode
c)
Salt bridge
d)
Voltmeter
23.
What unit of measurement do we use to measure electrical potential?
a)
Watts
b)
Volts
c)
Amps
d)
Ohms
24.
In which direction does electricity flow in a voltaic cell (battery)?
a)
Electrons flow from the cathode to the anode
b)
Electrons flow from left to right
c)
Electrons flow from anode to cathode
d)
Electrons flow from right to left
25.
What does OIL RIG mean?
a)
It's a pump used to remove oil from the ground
b)
Oxidation is losing protons, reduction is gaining protons
c)
Oxidation is losing electrons, reduction is gaining electrons
d)
Who knows?
26.
In a voltaic cell, the salt bridge is necessary for
a)
the movement of electrons to create a current
b)
the movement of ions to create a current
c)
the movement of electrons to maintain the neutrality of solution
d)
the movement of ions to maintain the neutrality of solution
27.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
28.
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+
29.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
30.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
31.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
32.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
33.
What is oxidation number of Fe in FeO ?
a)
+2
b)
-2
c)
0
d)
+1
34.
Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na
a)
Li
b)
Na
c)
O
d)
H
35.
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  --> Cu+2  + 2 e-
d)
Cu - 2e-  --> Cu+2
36.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
37.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
38.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
39.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
40.
What is the oxidation number of N in NO2-?
a)
-3
b)
+4
c)
-2
d)
+3
41.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
42.
What coefficient would Fe+2 have in the following reaction?
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
a)
1
b)
2
c)
3
d)
6
43.

Deterioration of metal due to the corrosive environment

a)

Erosion

b)

Corrosion

c)

Both A & B

d)

None of these

44.

composition of Yellow Rust?

a)

Fe203

b)

Fe3O4

c)

Fe2O3. 3H2O

d)

Fe3O4.3H2O

45.

Wet corrosion occurs due to?

a)

Electrochemical Reaction

b)

Chemical Reaction

c)

BOTH 1 & 2

d)

Anodic Reaction

46.

If the medium is acidic and in the absence of oxygen what is the product?

a)

Hydrogen

b)

hydroxyl ion

c)

hydroxyl and Hydrogen

d)

Oxygen

47.

The reaction which is taking place at anode is?

a)

Oxidation

b)

Loss of Electrons

c)

Both A & B

d)

Reduction

48.

The reaction which is taking place at cathode?

a)

Reduction

b)

oxidation

c)

Redox

d)

All the three

49.

If a Small pin hole is left on the surface of Iron when Zinc is coated, The rate of the corrosion ?

a)

Decreases

b)

Increases

c)

Remain Unaffected

50.

If a small pin hole is left when Iron is coated with Tin, Rate of corrosion?

a)

Increases

b)

Decreases

c)

Remains Unaffected

51.

H+ + ? →\rightarrow  H2

a)

Oxygen

b)

Electron

c)

hydrogen

d)

oxygen and electron

52.

? + e- →\rightarrow  OH- + H2

a)

H2

b)

OH-

c)

H2 O

d)

H+

53.

During corrosion process?

a)

Inside of the object changing from an element to compound

b)

The surface of the object Changing from an Element to compound

c)

No reaction

d)

The surface of the object changing from one element to another

54.

condition required for the corrosion to take place?

a)

Oxygen only

b)

water only

c)

Oxygen and water

d)

Water and carbon dioxide

55.

The rate of corrosion in the presence of Salt?

a)

No effect

b)

Speed up corrosion

c)

Slows down corrosion

56.

The process of corrosion is?

a)

Natural

b)

Spontaneous

c)

Non spontaneous

d)

Natural and Spontaneous

57.

Smaller the anodic area and larger the cathodic area, rate of corrosion?

a)

Increases

b)

Decreases

c)

Remains Same

58.

Larger the anodic area and smaller the cathodic area, Rate of corrosion?

a)

Decreases

b)

Increases

c)

Remains Same

59.

Nature of the Corrosion product formed on Ti ?

a)

Accelerates further Corrosion

b)

Prevent Metal from Further Corrosion

c)

Insoluble

d)

Prevent metal From further corrosion because oxide layer is Insoluble.

60.

When Two different metals come in contact with each other in a corrosive environment?

a)

Differential Metal Corrosion Occurs

b)

Galvanic corrosion occurs

c)

Corrosion current is developed

d)

All the three

61.

With Increase in temperature the rate of corrosion?

a)

Increases due to increase in conductivity and Diffusion of Ions

b)

Decreases due to increase in diffusion of ions

c)

Decreases due to increase in conductivity

d)

Increases due to decrease in Diffusion of ions

62.

When Fe and Zn come in contact with each other in a corrosive environment which is prone to corrosion?

a)

Fe being anode undergoes corrosion

b)

Fe being Cathode get prevented from corrosion

c)

Zn being anode get prevented from Corrosion

d)

Zn being cathode get prevented from corrosion

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