sInfoEra
Home
MCQs
Chemistry — Quiz
Chemistry MCQ Question - Electrochemistry
50 questions · Test your knowledge
Home
/
MCQs
/
Chemistry MCQ Question - Electrochemistry
1
In a galvanic cell
A
Chemical energy is converted into electricity
B
Chemical energy is converted into heat
C
Electrical energy is converted into chemical energy
D
Electrical energy is converted into heat
2
The degree of dissociation of week electrolyte increases as
A
Pressure increases
B
Dilution decreases
C
Dilution increases
D
None
3
Molten NaCl conducts electricity due to the presence of
A
Free electrons
B
Free molecules
C
Free ions
D
Atoms of Na and Cl
4
In which of the following reactions occur at cathode?
A
Cu2++2e-? Cu
B
Cu+2e-? Cu2+
C
Hg + O2 ? HgO
D
Mg + O2 ? MgO
5
Electricity in voltaic cell is produced due to
A
neutralization
B
oxidation
C
reduction
D
both b & c
6
In electrolytic solution conductance of electricity is due to
A
free electrons
B
ions
C
metals
D
electrodes
7
In electrolytic cell electricity carries
A
spontaneous reaction
B
non-wpontaneous reaction
C
neutralization
D
all of above
8
Reaction at anode is called
A
oxidation
B
reduction
C
redox
D
decomposition
9
In an electrolytic cell cathode provides electrons to
A
ve ion
B
?ve ion
C
neutral atom
D
does not provide any electron
10
In Galvanic cell electrons flow from anode to cathode through
A
external electric circuit
B
salt bridge
C
movement of ions
D
all of the above
11
Decrease in oxidation number is called
A
oxidation
B
reduction
C
oxidation-reduction
D
all of above represent same entity
12
For the measurement of standard electrode potential Zn is dipped in
A
1 M ZnO solution
B
1 M ZnSO4 solution
C
1.5 M ZnSO4 solution
D
0.1 M ZnSO4 solution
13
Right half cell contains __________ electrode
A
A1
B
Zn
C
Cu
D
Fe
14
Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in
A
Daniel cell
B
Downs cell
C
Voltaic cell
D
Nelsons cell
15
Salt bridge transfers
A
electrons
B
anion
C
current
D
ions
16
Voltaic cell can be recharged by
A
by addition of fresh solution
B
by replacing external circuit with external source of electricity
C
by removal of solution
D
by heating it
17
E0red of an element cab be calculated by comparing it with
A
New electrode of same element
B
SHE
C
1M solution of ions of respective element
D
2M solution of HCI
18
Temperature for the measurement of standard electrode potential is
A
298K
B
300K
C
30?C
D
310K
19
H2 gas in SHE is filled at pressure of
A
760mm of Hg
B
750mm of Hg
C
780mm of Hg
D
800mm of Hg
20
Potential of SHE is considered as
A
zero
B
unity
C
constant
D
multiple of 1
21
Chemical used in salt bridge is
A
KOH
B
KCI
C
KNO3
D
KBr
22
Electrode potential of Zn is
A
oxidation
B
reduction
C
oxidation-reduction
D
depends on the nature of the coupled electrode
23
List of elements based on hydrogen scale is called
A
periodic table
B
groups
C
periods
D
electrochemical series
24
The element that act as anode always have _______ position in electrochemical cell
A
higher
B
lower
C
in middle
D
no effect of position
25
In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be
A
greater
B
lesser
C
sum of reduction and oxidation potentials
D
none
26
Greater value of standard reduction potential greater will be tendency
A
to get oxidized
B
to get reduced
C
to accept electrons
D
both b and c
27
Greater value of standard reduction potential smaller will be tendency
A
to form positive ions
B
to form negative ions
C
gain electrons
D
all are possible
28
Secondary cell is
A
rechargeable
B
non rechargeable
C
electrolytic cell
D
Daniel cell
29
Lead accumulators are
A
secondary cell
B
primary cell
C
voltaic cell
D
both a & c
30
Density of H2SO4 in lead accumulator is
A
1.25g/cm3
B
1.3g/cm3
C
1.20g/cm3
D
1.15g/cm3
31
Capacity of one lead accumulator cell is
A
1.5 volts
B
2 volts
C
3 volts
D
1 volts
32
In alkaline battery the anode is made up of
A
MnO2
B
Zn
C
AgO2
D
cadmium
33
The strength of solution of an element whose electrode potential is to be measured is
A
2M
B
1N
C
1m
D
1M
34
Apparent charge on atom in molecule is
A
valency
B
coordination number
C
oxidation number
D
charge number
35
Voltaic cell is a
A
irreversible cell
B
reversible cell
C
alkaline cell
D
all of the above
36
In K2Cr2O7 the oxidation number of chromium is
A
7
B
6
C
-7
D
-6
37
Percentage of sulphuric acid in lead accumulator is
A
40%
B
25%
C
30%
D
50%
38
The reduction potential Zn is
A
0.76
B
-0.76
C
-0.55
D
0.55
39
The half cells are interconnected through
A
wire
B
salt bridge
C
electric circuit
D
no connection exists
40
I ? A elements are named as alkali metals because
A
Their oxides are basic
B
Their oxide and hydroxides are water soluble
C
Both a & b
D
They are found in earth
41
The word Alkali means
A
Base
B
Basic salt
C
Ashes
D
Spirit
42
Formula of Chile saltpetre is
A
NaNO3
B
CaCO3
C
Ba (NO3)2
D
NH4Cl
43
The elements which are very abundant in earth crust are
A
Si & A?
B
Ca & Mg
C
B & A?
D
All
44
The oxides of beryllium BeO is
A
Acidic
B
Basic
C
Amphoteric
D
Neutral
45
Which element is necessary for normal leaf development?
A
Si
B
Ba
C
Mg
D
Ca
46
Li is different from its family members due to
A
small size
B
high charge density
C
less electropositivity
D
all of the above
47
Carbonates of lithium are not stable like that of sodium due to
A
Low electronegativity
B
Low electropositivity
C
Low charge density
D
Not known yet
48
Nitrates of which pair of elements give different products on thermal decomposition?
A
Na K
B
Mg Ca
C
Li Na
D
Li Ca
49
Which one of the following is not an alkali metal?
A
Francium
B
Caesium
C
Rubidium
D
Radium
50
Which of the following sulphates is not soluble in water?
A
Sodium sulphate
B
Potassium sulphate
C
Zinc sulphate
D
Barium sulphate
Submit Quiz
Back to All Quizzes