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Chemistry XI - Electro Chemistry
1.
Pure water does not conduct electrcity because it is:
a) Readily decomposed
b) Neutral
c) Completely ionized
d) Almost unionized
2.
Molten NaCl conducts electricity due to the presence of:
a) Free ions
b) Free electrons
c) Atoms of sodium & chloride
d) Free molecules
3.
The electric charge for the deposition of 1g equivalent of a substance is:
a) 1 ampere/sec
b) 1 ampere/hr
c) 96500 C/sec
d) Charge on 1 mole
4.
Solid NaCl is a bad conductor of electricity because:
a) Solid NaCl is covalent
b) In solid state, there are no ions
c) In solid NaCl, there is no migration of ions
d) In solid NaCl, there are no electrons
5.
HCl solution conduct electricty because:
a) It dissolves
b) It associates
c) It ionises
d) It forms H - bonds
6.
The substances that conduct electricity in molten state are called:
a) Electrolytes
b) Non - electrolytes
c) Fused salts
d) Bad conductor
7.
The degree of dissociation of an electrolyte depends on:
a) Nature of electrolyte
b) Dilution
c) Temperature
d) All of the above
8.
The degree of ionization of substance depends on:
a) Size of solute molecules
b) Nature of solute molecules
c) Quantity of electricity passed
d) Nature of the vessel used
9.
Electrolytes is a process in which the cations & anions of the electrolyte are:
a) Hydrated
b) Ionized
c) Charged
d) Discharged at electrotodes
10.
The cathiodic reaction in electrolysis of dilute sulphuric acid with platinum electrode is:
a) Oxidation
b) Reduction
c) Both oxidation & reduction
d) Neutralization
11.
During electrolysis electrons are:
a) Lost
b) Gained
c) Gained by cations & lost by anions
d) Lost by anions and gained by cations
12.
The reaction taking place at anode & cathode are respectively:
a) Oxidation, reduction
b) Reduction, oxidation
c) Oxidation, hydrolysis
d) Reduction, hydrolysis
13.
The electrode through which eletrons enter the electrolytic solution is:
a) Anode
b) Cathode
c) May be anode or Cathode
d) None of these
14.
An aqueous solution of an electrolyte:
a) Conduct electricity without any chemical change
b) Is an insulator
c) Conduct eletricity with chemical decomposition
d) None of these
15.
Electrolytes dissociate in solution to give:
a) Only positive ions
b) Only negative ions
c) Both Positive & Negative ions
d) Neither positive nor negative ions
16.
Which of the following will lose charge at cathode?
a) Cations
b) Anions
c) Both Cations & Anions
d) Ions
17.
In aqueous solution, strong electrolytes ionise:
a) Almost completely
b) About 5%
c) About 20%
d) Incompletely
18.
According to Debye & Huckel, strong electrolytes in solution gets completely broken into:
a) Light & Heat
b) Electrons
c) Salt & water that move with current
d) Charged particles that conduct electricity
19.
Faraday's laws of electrolysis are related to the:
a) Molecular mass of the electrolyte
b) Atomic weight of the cation/anion
c) Atomic number of the cation/anion
d) Equivalent weight of the electrolyte
20.
The unit of electrochemical equivalent is:
a) gram/coulomb
b) gram
c) gram/Ampere
d) Coulomb/gram
21.
When the same quantity of electricity is passed through the solution of different electrolytes in series, the amount of products obtained are proportional to their:
a) Atomic weights
b) Chemical equivalent
c) gram molecular mass
d) gram atomic ions
22.
The electric charge for electrode deposition of 1g equivalent of a substance is:
a) 96500 coulombs
b) One ampere per second
c) One ampere for one hr
d) Charge in Faradays on one mole of the electrons
23.
The amount of Faradays required to liberate 1 mole of an element indicates:
a) Weight of element
b) Conductance of electrolyte
c) Charge on the ion of that element
d) Chemical equivalent
24.
The amount of current that would produce one gram equivalent of any substance is called:
a) Ampere
b) Faraday
c) Voltage
d) Chemical equivalent
25.
Ampere is unit of:
a) Current
b) Voltage
c) Resistance
d) Potential difference
26.
Which process is used for decoration, protection & repair of metals?
a) Electrolysis
b) Reduction
c) Electroplating
d) Ionization
27.
In lead accumulator, which chemical is used as an electrolyte?
a) Lead
b) Sulphuric acid
c) Lead dioxide
d) Ammonium Chloride
28.
In electroplating, the metal which has to be protected is made?
a) Anode
b) Cathode
c) Electrode
d) Electrolyte
29.
When the cells of lead accumulator are being charged, it is:
a) Galvenic cell
b) Daniell cell
c) Electrolytic Cell
d) All of the above
30.
A half - reactions is one that:
a) Involves only half a mole of electrolyte
b) Goes only half way to completion
c) Takes place at one electrode
d) Consumes half a unit of electircity
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