Electrochemistry Test

Question 1
4 / -1

In corrosion of iron

A
an electrochemical (galvanic cell) is formed in which Fe acts as anode and where O₂ is reduced, is the cathode

B
electrons flow from anode to cathode through the metal while ions flow through the water droplets

C
dissolved O₂oxidises Fe²⁺to Fe³⁺before it is deposited as rust (Fe₂O₃.H₂O)

D
All the above are observed

Question 2
4 / -1

Select the correct statement(s).

A
In lead-storage battery,galvanic cell are linked in series

B
Cathode and anode compartments are not seperated in a battery as oxidant and reductant both are solids

C
Recharging of a storage battery is a non-spontaneous (ΔG^° > 0)

D
All of the above

Question 3
4 / -1

"Maintenance-free" batteries now in use in place of commom batteries ,have

A
electrodes made of lead-lead oxide

B
electrodes made of calcium-containing lead alloy

C
non-aqueous solvents as medium

D
platinum electrodes

Question 4
4 / -1

In the following batteries, alkaline electrolytes are used
I. Mercury
II. Nickel-cadmium
III. Modified Leclanche cell Cell potential is found to be independent of [OH^-] in

A
I , II , III

B
I ,II

C
II , III

D
Only III

Question 5
4 / -1

Following are certain facts about batteries.
I. They are classified as primary, secondary and flow batteries.
II. Leclanche cell is a primary battery.
III. Lead-acid (storage) battery is a secondary cell.
Select the correct facts.

A
I , II

B
I , III

C
II , III

D
I , II , III

Question 6
4 / -1

In an atmosphere with industrial smog, copper corrodes to a basic sulphate (and also to a basic carbonate).This basic sulphate is

A
Cu₂(OH)₂SO₄

B
Cu(OH)₂(SO₄)₂

C
Cu(OH)SO₄

D
Cu(OH)(SO₄)₂

Question 7
4 / -1

In which of the following,reactants are not contained with the cell but are continuously supplied from the external source?

A
Lithium battery

B
Fuel cell

C
Dry cell

D
Lead-storage battery

Question 8
4 / -1

When a buried pipeline is protected from corrosion by connecting to Mg block ,It is known as

A
sacrified cathodic protection

B
sacrified anodic protection

C
impressed voltage protection

D
None of the above

Question 9
4 / -1

The rate of corrosion is more in the environment which is

A
dry

B
humid

C
salty

D
normal

Question 10
4 / -1

During galvanic corrosion, the more noble metal acts as

A
anode

B
cathode

C
anode and cathode

D
corroding metal

Question 11
4 / -1

Some or more factors/species can affect corrosion.
I. Temperature
II. pH
III. Impurity of metal
IV. Conc. HNO₃
Select the correct factors/species.

A
All

B
All except I

C
All except II , IV

D
All except I ,IV

Question 12
4 / -1

When a lead storage battery is discharged.

A
SO₂ gas is evolved

B
lead is formed

C
lead sulphate is consumed

D
sulphuric acid is consumed

Question 13
4 / -1

Select the correct statement(s) about corrosion.

A
It is the oxidative deterioration of a metal

B
It is an electrochemical phenomenon

C
Impurities present in iron enhance rusting by setting a number of miniature cells

D
All of the above

Question 14
4 / -1

Rusting of iron or corrosion of active metal is initiated by

A
cathodic reaction, when oxygen gas which is dissolved in H₂O, is reduced to OH^-

B
acid rain which oxidises metal to metal ion

C
Both (a) and (b)

D
None of the above

Question 15
4 / -1

Rusting of iron takes place in

A

B

C
Both (a) and (b)

D
None of these

Question 16
4 / -1

The non-chromium redox battery makes use of the reaction
Thus, cell diagram is

A
Cr²⁺|Cr³⁺(C₁)||Fe³⁺ (C₂)|Fe²⁺

B
Cr³⁺|Cr²⁺(C₁)||Fe²⁺ (C₂)|Fe³⁺

C
Fe|Fe²⁺,Fe³⁺ || Cr³⁺, Cr²⁺|Cr

D
Cr| Cr²⁺,Cr³⁺ || Fe³⁺,Fe²⁺|Fe

Question 17
4 / -1

Some statement(s) about dry-cell batteries are
I. Anode is a zinc metal and cathode is inert graphite in a paste of MnO₂ and C-black.
II. Electrolyte is a moist paste of NH₄CI and ZnCI₂.
III. Oxidation product is Zn²⁺ and reduction product is Mn₂O₃.
Select the correct statement(s).

A
I , II and III

B
I and II

C
I and III

D
II and III

Question 18
4 / -1

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

A
increase in number of ions

B
increase in ionic mobility of ions

C
100% ionisation of electrolyte at normal dilution.

D
increase in both, i.e number of ions and ionic mobility of ions.

Question 19
4 / -1

Resistivity of a metal is equal to resistance when cell is constant is

A
1 cm^-1

B
0.1 cm^-1

C
10 cm^-1

D
100 cm^-1

Question 20
4 / -1

Cell constant is maximum in case of a

A
Wire of length 100 cm and area 100 cm²

B
Wire of length 10 cm and area 10 cm²

C
One centimetre cube of material

D
Equal in all cases

Question 21
4 / -1

Comprehension Type
This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)
Passage I
Silver tarnish is mainly Ag₂S, which has the reduction potential

A tarnish silver spoon is placed in contact with a commercial available metallic product in a glass baking dish.Hot NaHCO₃ solution is added and tarnish part from silver spoon is removed.
Q.
What metal or metals do you think are in product?

A
Cu

B
Cu and Zn

C
Au

D
Al

Question 22
4 / -1

Passage I
Silver tarnish is mainly Ag₂S, which has the reduction potential

A tarnish silver spoon is placed in contact with a commercial available metallic product in a glass baking dish.Hot NaHCO₃ solution is added and tarnish part from silver spoon is removed.
Q.
Metal used converts

A
Ag₂S into Ag₂SO₄

B
Ag₂S into Ag₂CO₃ and S

C
Ag₂S into Ag and S^2-

D
Ag₂S into AgHCO₃

Question 23
4 / -1

Passage II
The electrodes in a lead-storage battery are made of Pb and PbO₂. During discharge following reactions occurs:
Pb +PbO₂+ 2H₂SO₄ → 2PbSO₄ + 2H₂O (Pb = 207); E⁰ = 2.00v
Q.
[SO₄^2-] due to 4.8 M H₂SO₄ in lead-storage battery is

A
1.0 X 10^-12M

B
4.8 M

C
3.3 X 10^-12M

D
9.6 M

Question 24
4 / -1

Passage II
The electrodes in a lead-storage battery are made of Pb and PbO₂. During discharge following reactions occurs:
Pb +PbO₂+ 2H₂SO₄ → 2PbSO₄ + 2H₂O (Pb = 207); E⁰ = 2.00v
Q.
Under zero load ,average voltage is 2.00 V,then ΔG^°is

A
386 kJ

B
-386 kJ

C
-193 kJ

D
-572 kJ

Question 25
4 / -1

One Integer Value Correct Type

This section contains a question, when worked out will result in an integer value from 0 to 9 (both inclusive)

Q.

An expensive but lighter alternate to the lead storage battery is the silver-zinc battery.

Ag₂O(s) + Zn(s) + H₂O(l) → Zn (OH)₂ (s) + 2Ag(s); E⁰ = 1.5544V

Numerical value of ΔG^° in scientific notation is X x 10^YJ.What is the value of X + Y?

A
8

B
5

C
7

D
3

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Electrochemistr...

Question 1

an electrochemical (galvanic cell) is formed in which Fe acts as anode and where O2 is reduced, is the cathode

electrons flow from anode to cathode through the metal while ions flow through the water droplets

dissolved O2 oxidises Fe2+ to Fe3+ before it is deposited as rust (Fe2O3.H2O)

All the above are observed

Question 2

In lead-storage battery,galvanic cell are linked in series

Cathode and anode compartments are not seperated in a battery as oxidant and reductant both are solids

Recharging of a storage battery is a non-spontaneous (ΔG° > 0)

All of the above

Question 3

electrodes made of lead-lead oxide

electrodes made of calcium-containing lead alloy

non-aqueous solvents as medium

platinum electrodes

Question 4

I , II , III

I ,II

II , III

Only III

Question 5

I , II

I , III

II , III

I , II , III

Question 6

Cu2(OH)2SO4

Cu(OH)2(SO4)2

Cu(OH)SO4

Cu(OH)(SO4)2

Question 7

Lithium battery

Fuel cell

Dry cell

Lead-storage battery

Question 8

sacrified cathodic protection

sacrified anodic protection

impressed voltage protection

None of the above

Question 9

dry

humid

salty

normal

Question 10

anode

cathode

anode and cathode

corroding metal

Question 11

All

All except I

All except II , IV

All except I ,IV

Question 12

SO2 gas is evolved

lead is formed

lead sulphate is consumed

sulphuric acid is consumed

Question 13

It is the oxidative deterioration of a metal

It is an electrochemical phenomenon

Impurities present in iron enhance rusting by setting a number of miniature cells

All of the above

Question 14

cathodic reaction, when oxygen gas which is dissolved in H2O, is reduced to OH-

acid rain which oxidises metal to metal ion

Both (a) and (b)

None of the above

Question 15

Both (a) and (b)

None of these

Question 16

Cr2+|Cr3+(C1)||Fe3+ (C2)|Fe2+

Cr3+|Cr2+(C1)||Fe2+ (C2)|Fe3+

Fe|Fe2+,Fe3+ || Cr3+, Cr2+|Cr

Cr| Cr2+,Cr3+ || Fe3+, Fe2+ |Fe

Question 17

an electrochemical (galvanic cell) is formed in which Fe acts as anode and where O₂ is reduced, is the cathode

dissolved O₂oxidises Fe²⁺to Fe³⁺before it is deposited as rust (Fe₂O₃.H₂O)

Recharging of a storage battery is a non-spontaneous (ΔG^° > 0)

Cu₂(OH)₂SO₄

Cu(OH)₂(SO₄)₂

Cu(OH)SO₄

Cu(OH)(SO₄)₂

SO₂ gas is evolved

cathodic reaction, when oxygen gas which is dissolved in H₂O, is reduced to OH^-

Cr²⁺|Cr³⁺(C₁)||Fe³⁺ (C₂)|Fe²⁺

Cr³⁺|Cr²⁺(C₁)||Fe²⁺ (C₂)|Fe³⁺

Fe|Fe²⁺,Fe³⁺ || Cr³⁺, Cr²⁺|Cr

Cr| Cr²⁺,Cr³⁺ || Fe³⁺,Fe²⁺|Fe

1 cm^-1

0.1 cm^-1

10 cm^-1

100 cm^-1

Wire of length 100 cm and area 100 cm²

Wire of length 10 cm and area 10 cm²

Ag₂S into Ag₂SO₄

Ag₂S into Ag₂CO₃ and S

Ag₂S into Ag and S^2-

Ag₂S into AgHCO₃

1.0 X 10^-12M

3.3 X 10^-12M