
Understanding Electrolysis for Metal Extraction
Authored by C Johnson
Chemistry
10th Grade
Used 1+ times

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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary method used to extract reactive metals from their oxides?
Distillation
Hydrolysis
Electrolysis
Reduction with carbon
Answer explanation
The primary method used to extract reactive metals from their oxides is electrolysis, where electricity is used to break down the metal oxide into its pure form.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following metals can be extracted by reduction with carbon?
Aluminium
Copper
Sodium
Potassium
Answer explanation
Copper can be extracted by reduction with carbon because it is less reactive than carbon, allowing carbon to displace it in the extraction process.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is electrolysis considered expensive for metal extraction?
It requires a lot of energy
It is labor-intensive
It requires special chemicals
It produces hazardous waste
Answer explanation
Electrolysis is considered expensive for metal extraction because it requires a lot of energy to separate the metal from its compounds.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of cryolite in the electrolysis of aluminium oxide?
It lowers the melting point of aluminium oxide
It purifies the aluminium oxide
It increases the electrical conductivity
It acts as a catalyst
Answer explanation
Cryolite lowers the melting point of aluminium oxide, facilitating the electrolysis process.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the oxygen ions at the anode during electrolysis?
They lose electrons
They gain electrons
They combine with aluminium
They remain unchanged
Answer explanation
During electrolysis, oxygen ions at the anode lose electrons to form oxygen gas. This process is essential for the overall reaction to occur.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is formed at the cathode during the electrolysis of aluminium oxide?
Oxygen gas
Aluminium metal
Hydrogen gas
Carbon dioxide
Answer explanation
During the electrolysis of aluminium oxide, aluminium metal is formed at the cathode. This is the correct choice as the process involves the reduction of aluminium ions to form the metal.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What mnemonic helps to remember the process of oxidation and reduction?
LEO GER
OIL RIG
RED CAT
AN OX
Answer explanation
The correct mnemonic to remember the process of oxidation and reduction is OIL RIG, where Oxidation Is Loss (of electrons) and Reduction Is Gain (of electrons).
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