WorksheetsApplication of Electrolysis
Total questions: 15
Worksheet time: 8mins
Chlorine is produced from the electrolysis of sodium chloride solution in a diaphragm cell. What is the use of the diaphragm in the cell
Removes impurities from sodium chloride
Increases the rate of production of chlorine
Prevents chlorine from escaping from the cell
Prevents chlorine from coming into contact with sodium hydroxide
What is the advantage of producing sodium hydroxide using a mercury cell?
The voltage required for the elctrolysis is lower
The sodium hydroxide formed has a higher purity
The by products are environmentally friendly
The process is more economical
Which of the following statements is NOT true about the rusting of an iron nail
Corrosion is the oxidation deterioration of a metal by an electrochemical process
Iron rusts faster if it is in contact with a more electropositive metals
Rusting of iron occurs when oxygen and water are present
When iron rusts, iron is first oxidised to Fe2+ ions
What is frequently done to protect aluminium articles from subsequent corrosion?
Aluminium is coated with an inert metal
Cryolite is added to the aluminium ore before it is used
Aluminium is first oxidised by air to form an inert oxide layer
The aluminium is made the anode during electrolysis
Industrially, aluminium is extracted from the electrolysis of its molten ore. However, why is more emphasis placed on recycling of aluminium than the extraction of aluminium from its ore?
The extraction process is very difficult
The cost of extracting aluminium from its ore is very high
Extracting aluminium from its ore will contaminate the environment
Extracting aluminium from its ore will cause the source to be depleted
One of the alloys used in a dental filling is Ag3Sn. The standard reduction potentials of Al3+(aq)/Al(s) and Sn2+(aq)/Ag3Sn(s) half cells are -1.66V and -0.05V respectively. Which of the following statements is NOT true when a piece of aluminium comes into contact with the dental filling?
The e.m.f. of the electrochemical cell created is +1.61V
The electrons flow from the dental filling to aluminium
Aluminium acts as the anode
Al3+ ions are produced
A large number of objects such as bathroom accessories, are metal-plated plastics. Which of the following is NOT the advantage of used metal-plated plastic objects over a metal object?
More durable
Less expensive
Lighter
More resistant to corrosion
Which statement explains why graphite powder is spread onto plastic material first in plastic electroplating process?
Graphite is an electric conductor
Plastic becomes more resistant to heat
Plastic electroplating process is accelerated
Graphite can form chemical bond with plastic
Which of the following pairs of substances is used in the industrial production of chlorine by electrolysis?
Carbon anode and dilute sodium chloride
Carbon anode and concentrated sodium chloride
Platinum anode and dilute sodium chloride
Platinum anode and molten sodium chloride
All of the following are advantages of using a hydrogen-oxygen fuel cell in an electric car except
lighter
smaller size
higher voltage
cheaper
Which of the following ions found in the waste discharge from factories can be eliminated by electrolysis?
1. Ni2+
2. Cd2+
3. Al3+
1, 2 and 3
1 and 2
2 and 3
1
Which of the following is NOT true about the anodising of aluminium?
Aluminium is made the anode
Oxygen gas is liberated at the anode
Hydrogen gas is formed at the cathode
The electrolyte is a solution of aluminium nitrate
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
Chromium and nickel are used in the electroplating industry. Whih of the following is/are true about electroplating?
1. The material to be plated is the anode
2. Reduction occurs at the cathode
3. The electrolyte used contains the plating metal ions
1
1 and 2
2 and 3
1, 2 and 3
Mercury and diahragm cells are used in the industrial processes for the electrolysis of brine. Which of the following is NOT the product of the two processes?
Sodium metal
Sodium hydroxide solution
Chlorine gas
Hydrogen gas
