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Grade 11 Exam  >  Grade 11 Tests  >  Chemistry for Grade 11 (IGCSE)  >  Test: Addition Reactions & Alcohols - Grade 11 MCQ

Test: Addition Reactions & Alcohols - Grade 11 MCQ


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15 Questions MCQ Test Chemistry for Grade 11 (IGCSE) - Test: Addition Reactions & Alcohols

Test: Addition Reactions & Alcohols for Grade 11 2024 is part of Chemistry for Grade 11 (IGCSE) preparation. The Test: Addition Reactions & Alcohols questions and answers have been prepared according to the Grade 11 exam syllabus.The Test: Addition Reactions & Alcohols MCQs are made for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Addition Reactions & Alcohols below.
Solutions of Test: Addition Reactions & Alcohols questions in English are available as part of our Chemistry for Grade 11 (IGCSE) for Grade 11 & Test: Addition Reactions & Alcohols solutions in Hindi for Chemistry for Grade 11 (IGCSE) course. Download more important topics, notes, lectures and mock test series for Grade 11 Exam by signing up for free. Attempt Test: Addition Reactions & Alcohols | 15 questions in 15 minutes | Mock test for Grade 11 preparation | Free important questions MCQ to study Chemistry for Grade 11 (IGCSE) for Grade 11 Exam | Download free PDF with solutions
Test: Addition Reactions & Alcohols - Question 1
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What type of reaction involves the addition of atoms from a basic molecule across the C=C double bond in alkenes?

Detailed Solution for Test: Addition Reactions & Alcohols - Question 1
Addition reactions in alkenes involve the addition of atoms from a basic molecule across the C=C double bond. This process leads to the formation of new compounds by adding atoms or groups to the carbon-carbon double bond. It is a fundamental concept in organic chemistry, showcasing how alkenes can react with various reagents to form different products.
Test: Addition Reactions & Alcohols - Question 2
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In the hydrogenation of alkenes to form alkanes, what is the purpose of employing a nickel catalyst and conducting the reaction at around 150°C?

Detailed Solution for Test: Addition Reactions & Alcohols - Question 2
The use of a nickel catalyst in the hydrogenation of alkenes serves to lower the activation energy of the reaction, facilitating the conversion of alkenes into alkanes. Operating at around 150°C helps to provide the necessary energy for the reaction to proceed while ensuring the catalyst's effectiveness in promoting the desired chemical transformation.
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Test: Addition Reactions & Alcohols - Question 3
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What is the industrial significance of the hydration reaction involving alkenes and steam?

Detailed Solution for Test: Addition Reactions & Alcohols - Question 3
The hydration reaction between alkenes and steam is crucial for the industrial production of alcohols. By adding water molecules to the alkene, this process leads to the formation of alcohols, which have widespread applications in various industries, including pharmaceuticals, cosmetics, and solvents. It represents a key method for synthesizing alcohols efficiently on a large scale.
Test: Addition Reactions & Alcohols - Question 4
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What role does concentrated phosphoric acid play in the addition reaction of alkenes with steam to form alcohols?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 4
Concentrated phosphoric acid serves as a catalyst in the hydration reaction of alkenes with steam to produce alcohols. As a catalyst, it speeds up the reaction rate without being consumed, allowing the transformation to occur under milder conditions. This catalytic role is essential for efficiently converting alkenes into alcohols in industrial settings.
Test: Addition Reactions & Alcohols - Question 5
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Which method is used for the production of ethanol involving the hydration of ethene with steam?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 5
The method used for the production of ethanol involving the hydration of ethene with steam is hydrogenation. This process involves combining ethene with steam over a heated catalyst of phosphoric acid to produce gaseous ethanol, which is then cooled and condensed into a liquid state for various applications.
Test: Addition Reactions & Alcohols - Question 6
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What are the byproducts generated when alcohols, including ethanol, undergo combustion in excess oxygen?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 6
When alcohols, such as ethanol, undergo combustion in excess oxygen, they generate carbon dioxide (CO2) and water (H2O) as byproducts. This process is essential for understanding the chemical reactions involved in the combustion of alcohols.
Test: Addition Reactions & Alcohols - Question 7
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At what temperature does the hydration of ethene typically occur when directed over a heated catalyst of phosphoric acid?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 7
The hydration of ethene typically occurs at temperatures around 300°C when directed over a heated catalyst of phosphoric acid. This high temperature facilitates the reaction to produce gaseous ethanol, which can then be further processed for various industrial and commercial purposes.Response:
Test: Addition Reactions & Alcohols - Question 8
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What is the key factor that yeast requires for the fermentation process to occur efficiently?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 8
Yeast requires the absence of oxygen for efficient fermentation to occur. In the absence of oxygen, yeast undergoes anaerobic respiration, breaking down glucose to produce ethanol and carbon dioxide. This process is crucial for the production of alcohol through fermentation.
Test: Addition Reactions & Alcohols - Question 9
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Why is it important to maintain the fermentation process within a specific temperature range?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 9
Maintaining the fermentation process within a specific temperature range is important to prevent the denaturation of enzymes. If the temperature is too high, the enzymes in the yeast may become denatured, affecting their ability to facilitate the breakdown of starch or sugar into glucose efficiently.
Test: Addition Reactions & Alcohols - Question 10
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What is the primary role of yeast in the fermentation of glucose?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 10
Yeast plays a crucial role in the fermentation of glucose by breaking down starch or sugar into glucose. This breakdown process is facilitated by enzymes present in the yeast, which convert complex carbohydrates into simpler sugars that can be further metabolized to produce ethanol and carbon dioxide.
Test: Addition Reactions & Alcohols - Question 11
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At what point in the fermentation process are yeast typically deactivated?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 11
Yeast are typically deactivated once the alcohol concentration reaches approximately 15% during the fermentation process. At this point, the high alcohol concentration becomes toxic to the yeast, leading to their deactivation. This signals the end of the fermentation process for that batch.
Test: Addition Reactions & Alcohols - Question 12
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What is one of the key differences between batch fermentation and continuous fermentation in ethanol production?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 12
One significant difference between batch fermentation and continuous fermentation in ethanol production lies in the scale of production. In batch fermentation, the process is carried out in discrete batches where the fermentation vessel is filled, the process runs its course, and then the vessel is emptied before a new batch begins. On the other hand, continuous fermentation involves a steady inflow of nutrients and a continuous outflow of product, allowing for a more consistent and uninterrupted production process. This distinction impacts factors such as efficiency, control over variables, and overall output in ethanol production.
Test: Addition Reactions & Alcohols - Question 13
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What role does yeast play in ethanol production through fermentation processes?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 13
Yeast plays a crucial role in ethanol production by acting as a catalyst in breaking down complex sugars into simpler compounds like glucose and fructose through the process of fermentation. This breakdown of sugars by yeast produces ethanol as well as carbon dioxide as byproducts. The ability of yeast to ferment sugars into alcohol is essential in the production of ethanol, making it a fundamental component in the process.
Test: Addition Reactions & Alcohols - Question 14
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In ethanol production, what is the purpose of distillation following fermentation?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 14
Distillation following fermentation in ethanol production serves the purpose of increasing the alcohol content of the solution. Through the distillation process, the ethanol is separated from the remaining components of the solution, concentrating the alcohol content. This step is crucial in obtaining ethanol of higher purity and strength, making it suitable for various industrial and commercial applications.
Test: Addition Reactions & Alcohols - Question 15
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Why is it important to control the temperature during ethanol fermentation processes?
Detailed Solution for Test: Addition Reactions & Alcohols - Question 15
Controlling the temperature during ethanol fermentation processes is essential to ensure the optimal activity of yeast. Yeast, the microorganism responsible for fermenting sugars into ethanol, functions best within a specific temperature range. Maintaining this temperature range helps to promote efficient fermentation, ensuring that yeast can carry out the conversion of sugars into ethanol effectively. Temperature control is vital in maximizing ethanol production yield and maintaining the overall quality of the final product.
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