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Published on: 02/09/2022
QB365 provides a detailed and simple solution for every Possible Creative Questions in Class 12 Chemistry Subject - Electro Chemistry, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
The specific conductance of a 0.01 M solution of KCI is 0.0014 ohm-1 em-1 at 25°C. Its equivalent conductance is ______.
14 ohm-1 cm2eq-1
140 ohm-1 cm2eq-1
1.4 ohm-1 cm2eq-1
0.14 ohm-1 cm2eq-1
2.
Faraday's laws of electrolysis are related to ______.
atomic number of the cation
atomic number of the anion
equivalent weight of the electrolyte
speed of the cation
3.
When one coulomb of electricity is passed through an electrolytic solution the mass deposited on the electrode is equal to ______.
equivalent weight
molecular weight
electrochemical equivalent
one gram
4.
For the given cell Cr(s)|Cr3+(aq)||Cu2+(aq)|Cu(s) which is correct?
Cr is the anode
Cu is the anode
Overall cell reaction is 2Cr3+(aq) +3Cu(s) ⟶ 2Cr(s) + 3Cu2+(aq)
Cu is the anode and Overall cell reaction is 2Cr3+(aq) +3Cu(s) ⟶ 2Cr(s) + 3Cu2+(aq)
5.
What happens during the electrolysis of molten sodium chloride?
Cl2 is released at the cathode
Liquid sodium is obtained at the anode
The emf of the overall reaction is -4.07 V
Cl2 is released at the cathode and Liquid sodium is obtained at the anode
6.
The laws of electrolysis were enunciated first by
Dalton
Faraday
Kekule
Avogadro
7.
Recharging of lead storage battery involves ______.
anode is reduced to pb
cathode is reduced to pb
cathode is oxidised to pb
anode is oxidised to pbO2
8.
Using the data given below find out the strongest reducing agent ______.
\({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
\({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)
Cr
Cr3+
Cl-
Mn2+
9.
The limiting molar conductivities of HCI, CH3COONa and NaCI are respectively 425, 190 and 150 mho cm2 mol-1 at 25°C. The molar conductivity of 0.1 M acetic acid is 9.2 mho cm2 mol-1. The degree of dissociation of 0.1 M acetic acid is ______.
0.10
0.02
0.19
0.03
10.
Kohlrausch's law is applied to calculate ________.
molar conductance at infinite dilution of a weak electrolyte
degree of dissociation of weak electrolyte
solubility of a sparingly soluble salt
all the above
11.
A device in which spontaneous chemical reaction generates electric current ________.
Galvanic cell
Voltaic cell
Daniel cell
All the above
12.
Which of the statements about electrolytic conductance is not true?
Conductivity increases with decrease in viscosity.
Higher dielectric constant shows lower conductance in solution.
Temperature increases, conductance also increases.
Molar conductance increases with increase in dilution.
13.
Which among the following is the strongest reducing agent?
F2
Cl2
Zn
Li
14.
Pick out the correct statement regarding resistance of an electrolytic solution ________.
It is inversely proportional to the length (I)
It is inversely proportional to the cross sectional area (A)
It is directly proportional to the cross sectional area (A)
Resistivity is denoted by p (rho)
15.
Which one of the following solution has highest equivalent conductance?
0.1 M NaCI
0.05 M NaCI
0.005 M NaCI
0.25 M NaCI
1.
(a)
14 ohm-1 cm2eq-1
2.
(c)
equivalent weight of the electrolyte
3.
(c)
electrochemical equivalent
4.
(a)
Cr is the anode
5.
(c)
The emf of the overall reaction is -4.07 V
6.
(b)
Faraday
7.
(a)
anode is reduced to pb
8.
(a)
Cr
9.
(c)
0.19
10.
(d)
all the above
11.
(d)
All the above
12.
(b)
Higher dielectric constant shows lower conductance in solution.
13.
(d)
Li
14.
(b)
It is inversely proportional to the cross sectional area (A)
15.
(c)
0.005 M NaCI
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