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Grade 11 Exam  >  Grade 11 Tests  >  Chemistry for Grade 11 (IGCSE)  >  Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Grade 11 MCQ

Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Grade 11 MCQ


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15 Questions MCQ Test Chemistry for Grade 11 (IGCSE) - Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite

Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite for Grade 11 2024 is part of Chemistry for Grade 11 (IGCSE) preparation. The Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite questions and answers have been prepared according to the Grade 11 exam syllabus.The Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite MCQs are made for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite below.
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Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 1
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What process involves the removal of oxygen from metal oxide ores during extraction?

Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 1
During the extraction of metals from their oxide ores, a reduction reaction takes place where oxygen is removed. This process is essential for obtaining pure metals from their ores. Reducing agents like carbon or carbon monoxide are commonly used to facilitate this reduction reaction, resulting in the extraction of the metal in its elemental form.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 2
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Which types of metals can be directly mined from the Earth's crust due to their low reactivity?

Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 2
Native metals, such as gold and platinum, exist in nature as uncombined elements due to their low reactivity. These metals do not easily react with other elements or compounds, allowing them to be found in a pure, uncombined form in nature. This characteristic makes them suitable for direct mining from the Earth's crust.
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Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 3
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What determines the extraction method for a metal according to its position in the reactivity series?

Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 3
The reactivity of a metal determines the extraction method required for obtaining it from its ores. Metals higher in the reactivity series necessitate more complex extraction processes, such as electrolysis, due to their strong tendency to form compounds with other elements. Conversely, metals lower in the reactivity series can often be extracted by simpler methods like heating with carbon.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 4
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Which metal ore is commonly known as iron ore?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 4
Hematite is a type of iron ore that is commonly found and mined for the extraction of iron. It is an oxide ore of iron and is known for its reddish-brown color. Through the reduction process, iron can be extracted from hematite ore, which plays a crucial role in various industrial applications, especially in the production of steel.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 5
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What is the primary purpose of introducing limestone into the blast furnace during the iron extraction process?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 5
The primary reason for introducing limestone into the blast furnace during the iron extraction process is to eliminate impurities from the iron ore. Limestone undergoes thermal decomposition to produce calcium oxide, which then reacts with impurities like silicon dioxide to form a molten slag. This slag helps in separating impurities from the molten iron, ensuring a purer final product.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 6
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In which zone of the blast furnace does the reduction of carbon dioxide to carbon monoxide occur during the iron extraction process?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 6
The reduction of carbon dioxide to carbon monoxide takes place in Zone 2 of the blast furnace during the iron extraction process. This reaction occurs at elevated temperatures as coke reacts further with carbon dioxide, leading to the formation of carbon monoxide which is crucial for the subsequent steps in the process.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 7
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What role does hot air play in the blast furnace during the extraction of iron from hematite?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 7
Hot air blown into the bottom of the blast furnace serves the purpose of heating the furnace itself. This is essential to maintain the high temperatures required for the various reactions involved in the iron extraction process. The heat generated helps sustain the overall functioning of the furnace.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 8
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Which compound is formed as a result of the reaction between calcium oxide from limestone and silicon dioxide during iron extraction?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 8
The reaction between calcium oxide from limestone and silicon dioxide produces calcium silicate during the iron extraction process. This compound forms a molten slag that floats on the molten iron, allowing for the removal of impurities and ensuring a cleaner extraction of iron.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 9
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In the extraction of iron from hematite, what is the primary purpose of burning carbon (coke) in Zone 1?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 9
Burning of carbon (coke) in Zone 1 is primarily conducted to provide heat and produce carbon dioxide. This step is essential in the extraction process to initiate the necessary reactions for the reduction of iron(III) oxide in subsequent stages.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 10
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Which reaction occurs in Zone 2 of the extraction process of iron from hematite?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 10
Zone 2 involves the reduction of carbon dioxide to carbon monoxide. This reaction, CO2 (g) + C (s) → 2CO (g), is crucial in the extraction process as it provides the necessary carbon monoxide for the subsequent reduction of iron(III) oxide.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 11
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What is the key role of calcium carbonate (limestone) in the extraction of iron from hematite?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 11
When calcium carbonate (limestone) is heated, it undergoes thermal decomposition to produce calcium oxide and carbon dioxide. The carbon dioxide generated in this process plays a significant role in various stages of the iron extraction process.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 12
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Which compound is formed during the process of slag formation in the extraction of iron from hematite?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 12
During the formation of slag, the compounds CaO (calcium oxide) and SiO2 (silicon dioxide) react to produce calcium silicate (CaSiO3). This slag formation is crucial in the extraction process to remove impurities and achieve the desired quality of iron.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 13
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What is the primary ore that contains aluminum, necessitating its extraction through electrolysis?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 13
Bauxite is the primary ore containing aluminum oxide, requiring the extraction of aluminum through the process of electrolysis. This process is essential due to aluminum's higher reactivity compared to carbon, making carbon reduction ineffective for aluminum extraction.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 14
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Why is aluminum oxide dissolved in molten cryolite during the extraction process?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 14
Aluminum oxide is dissolved in molten cryolite to lower the overall melting point of the mixture. This is crucial because aluminum oxide has a high melting point above 2000°C, which is energy-intensive and costly. By using cryolite, the melting point is reduced without affecting the necessary reactions, making the extraction process more efficient and cost-effective.
Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 15
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In the electrolysis cell used for aluminum extraction, what role does graphite play?
Detailed Solution for Test: Extraction of Metals & Extraction of Iron from Hematite & Extraction of Aluminium from Bauxite - Question 15
Graphite in the electrolysis cell plays the role of the negative electrode. It provides a surface for the reduction of aluminum ions, leading to the formation of molten aluminum at the base of the cell. This process is crucial for the extraction of aluminum through electrolysis.
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