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WorksheetsFaraday's Laws and Uses of Electrolysis
Total questions: 10
Worksheet time: 5mins
Which of the following corresponds to the first law of electrolysis?
m = zIt
n = Q/F
1F = 96500C
The extraction of aluminium involves the electrolysis of purified bauxite dissolved in molten cryolite, Na3AlF6. What is the main purpose of the cryolite?
to reduce the melting point of the mixture
to provide an additional source of aluminium
to increase the electrical conductivity of the melt
to prevent the re-oxidation of the aluminium formed at the cathode
Diagram shows the application of of electrolysis in...
Extraction of metals
Purification of metals
Electroplating of metals
Wastewater treatment using Electrocoagulation
What is the purpose of using electrolysis in the extraction of metals?
To increase the melting point of the metal
To decrease the electrical conductivity of the metal
To purify the metal
To increase the chemical reactivity of the metal
What is the main advantage of electroplating of metals?
To prevent corrosion
To increase the weight of the metal
To decrease the electrical conductivity of the metal
To reduce the melting point of the metal
A steady current of 4 amperes is passed through aqueous copper (II) sulphate solution for 1800 seconds using platinum electrodes. Calculate the mass of copper deposited. (Cu = 63.5 g/mol, 1F = 96500C)
2.4 g
4.8 g
1.7 g
5.8 g
Zinc-Plated Iron is also known as
Iron ore
Galvanized Iron
Soft iron
Hard Iron
What is the unit of electric charge in Faraday's laws?
Joule
Coulomb
Ampere
Ohm
If a current of 2.5 A is passed through a solution for 3 hours, calculate the charge passed.
75,000 C
30,000 C
40,000 C
27,000 C
What is Faraday's first law of electrolysis?
The amount of substance deposited is directly proportional to the current
The amount of substance deposited is inversely proportional to the current.
The amount of substance deposited is proportional to the voltage.
The amount of substance deposited is constant.
