Magnesium is extracted by the electrolysis of molten magnesium chloride. Magnesium is extracted by electrolysis rather than by heating its oxide with carbon. Why?

The extraction of metals from their ores is known as metallurgy. The method of extraction of metals from their ores is dependent on the reactivity series. Unreactive metals like gold and silver occur in nature in their pure form. The less reactive metals are directly reduced to obtain the metal. More reactive metals occur in more stable compounds, hence techniques like electrolysis are employed for their extraction. Magnesium is also extracted from its ore through electrolysis as it is highly reactive.

Magnesium is extracted by the electrolysis of molten magnesium chloride. Name a gaseous element which is inert.

The method of extraction of metals from their ores is dependent on the reactivity series. Magnesium is extracted through electrolysis. During electrolysis of magnesium, the molten magnesium obtained forms a layer over molten magnesium chloride. A stream of inert gas is also passed through the tank, to prevent oxidation of the formed magnesium. Inert gases are those that do not react with the environment. This is because they have completely filled outermost shells. They are also known as noble gases. Examples of inert gases are helium, neon, argon, etc.

Carbon monoxide can be removed from coal gas by mixing it with steam and passing the mixture over a catalyst of iron ( III ) oxide at 400 ° C . CO + H 2 O ↔ CO 2 + H 2 . Iron ( III ) oxide reacts with acids to form a solution containing iron ( III ) ions. Describe a test for aqueous iron ( III ) ions. Give the result.

Coal gas consists of carbon monoxide, methane, hydrogen sulfide, etc. which does not make it a favourable source of fuel. Carbon monoxide is removed from coal gas by reacting it with steam over a catalyst of iron ( III ) oxide. The reaction is known as water-gas shift reaction. All metal oxides are basic in nature. They react with acids to form corresponding salt and water. When iron ( III ) oxide reacts with dilute hydrochloric acid, it gives formation of iron ( III ) chloride and water. Fe 2 O 3 iron ( III ) oxide + 6 HCl hydrochloric acid → 2 FeCl 3 iron ( III ) chloride + 3 H 2 O water The formation of iron ( III ) ions in solution can be confirmed using multiple tests. For example, to confirm the presence of iron ( III ) nitrate in an unknown solution, a few drops of sodium hydroxide solution is added to it. The presence of iron ( III ) ions gives the formation of hydroxide precipitates. The formation of an orange-brown precipitate indicates the presence of iron ( III ) nitrate.

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Magnesium is extracted by the electrolysis of molten magnesium chloride.

What information in the diagram suggests that magnesium is less dense than molten magnesium chloride?

Important Questions on Cambridge IGCSE Exam Questions from Paper 2

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Magnesium is extracted by the electrolysis of molten magnesium chloride.

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Magnesium is extracted by electrolysis rather than by heating its oxide with carbon. Why?

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Magnesium is extracted by the electrolysis of molten magnesium chloride.

Suggest why a stream of inert gas is blown over the surface of the molten magnesium.

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Magnesium is extracted by the electrolysis of molten magnesium chloride.

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Name a gaseous element which is inert.

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

In some old magnesium manufacturing plants, coal gas is blown over the surface of the magnesium. The list shows the main substances in coal gas: carbon monoxide, ethene, hydrogen, hydrogen sulfide, methane. Draw the structure of ethene showing all atoms and bonds.

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

In some old magnesium manufacturing plants, coal gas is blown over the surface of the magnesium. The list shows the main substances in coal gas: carbon monoxide, ethene, hydrogen, hydrogen sulfide, methane. Suggest two hazards of using coal gas by referring to two specific substances in the list.

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Carbon monoxide can be removed from coal gas by mixing it with steam and passing the mixture over a catalyst of iron $(III)$ oxide at $400 ° C$ .

$CO + H_{2} O \leftrightarrow {CO}_{2} + H_{2}$ .

Write a word equation for this reaction.

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Upper Secondary: IGCSE

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Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Carbon monoxide can be removed from coal gas by mixing it with steam and passing the mixture over a catalyst of iron $(III)$ oxide at $400 ° C$ .

$CO + H_{2} O \leftrightarrow {CO}_{2} + H_{2}$ .

What does the symbol $\leftrightarrow$ mean?

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Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 20 - Cambridge IGCSE Exam Questions from Paper 2>CAMBRIDGE IGCSE EXAM QUESTIONS from Paper 2>Q 4

Carbon monoxide can be removed from coal gas by mixing it with steam and passing the mixture over a catalyst of iron $(III)$ oxide at $400 ° C$ .

$CO + H_{2} O \leftrightarrow {CO}_{2} + H_{2}$ .

Iron $(III)$ oxide reacts with acids to form a solution containing iron $(III)$ ions. Describe a test for aqueous iron $(III)$ ions. Give the result.

Magnesium is extracted by the electrolysis of molten magnesium chloride. What information in the diagram suggests that magnesium is less dense than molten magnesium chloride?

Important Questions on Cambridge IGCSE Exam Questions from Paper 2

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Magnesium is extracted by the electrolysis of molten magnesium chloride.

What information in the diagram suggests that magnesium is less dense than molten magnesium chloride?