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Grade 11 Exam  >  Grade 11 Tests  >  Chemistry for Grade 11 (IGCSE)  >  Test: Identification of Anions, Cations & Gases - Grade 11 MCQ

Test: Identification of Anions, Cations & Gases - Grade 11 MCQ


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10 Questions MCQ Test Chemistry for Grade 11 (IGCSE) - Test: Identification of Anions, Cations & Gases

Test: Identification of Anions, Cations & Gases for Grade 11 2024 is part of Chemistry for Grade 11 (IGCSE) preparation. The Test: Identification of Anions, Cations & Gases questions and answers have been prepared according to the Grade 11 exam syllabus.The Test: Identification of Anions, Cations & Gases MCQs are made for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Identification of Anions, Cations & Gases below.
Solutions of Test: Identification of Anions, Cations & Gases questions in English are available as part of our Chemistry for Grade 11 (IGCSE) for Grade 11 & Test: Identification of Anions, Cations & Gases 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: Identification of Anions, Cations & Gases | 10 questions in 10 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: Identification of Anions, Cations & Gases - Question 1
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When conducting the identification of anions, why is it crucial to carefully choose the acid for acidification in the presence of aqueous silver nitrate and aqueous barium nitrate/chloride solutions?

Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 1
It is essential to select the appropriate acid for acidification to prevent the formation of white precipitates due to chloride and sulfate ions present in the acid. For instance, if acidifying aqueous silver nitrate with hydrochloric acid, a white precipitate forms due to the chloride ions. Similarly, acidifying aqueous barium nitrate/chloride with sulfuric acid results in a white precipitate due to the sulfate ions. This careful selection ensures accurate results in the identification process.
Test: Identification of Anions, Cations & Gases - Question 2
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How can metal cations dissolved in water be distinguished based on the hue of the solid produced when sodium hydroxide or ammonia is introduced?

Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 2
Metal cations dissolved in water can be distinguished based on the color alterations or solid formations that occur when sodium hydroxide or ammonia is introduced. This method helps in identifying different metal ions by observing the changes in color or the formation of solids, aiding in the qualitative analysis of cations.
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Test: Identification of Anions, Cations & Gases - Question 3
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How can calcium ions (Ca²⁺) be distinguished from zinc (Zn²⁺) and aluminum (Al³⁺) ions in a solution?

Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 3
Calcium ions (Ca²⁺) can be differentiated from zinc (Zn²⁺) and aluminum (Al³⁺) ions by the fact that calcium hydroxide forms a precipitate that remains insoluble in excess NaOH, unlike zinc and aluminum hydroxides. This characteristic allows for the selective identification of calcium ions in a mixture of cations.
Test: Identification of Anions, Cations & Gases - Question 4
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In the context of chemistry experiments, what is the significance of observing the color of a flame during a flame test for metal ions?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 4
The color of a flame during a flame test is crucial for identifying the metal ion present. Each metal ion emits a characteristic color when heated in a flame due to the energy transitions of its electrons. This phenomenon is used as a qualitative test to distinguish between different metal ions based on the unique colors they produce. For example, lithium compounds typically give a bright red flame, while copper compounds produce a blue-green flame. By observing and noting the color of the flame, chemists can make informed conclusions about the presence of specific metal ions in a sample.
Test: Identification of Anions, Cations & Gases - Question 5
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What is the purpose of employing a flame test to recognize metal cations?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 5
The flame test is used to identify metal cations based on the characteristic color of the flame they produce when exposed to a Bunsen burner. Different metal ions emit distinct colors when heated in a flame due to their unique electronic configurations. This method is a simple but effective way to qualitatively analyze and distinguish between various metal ions present in a sample.
Test: Identification of Anions, Cations & Gases - Question 6
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Why is it important to cleanse the wire loop used in a flame test before conducting the test for metal ions?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 6
Cleansing the wire loop before conducting a flame test is crucial to prevent contamination of the sample. Contamination can lead to inaccurate results as it may introduce impurities that interfere with the identification of the metal ion based on the color of the flame. Therefore, ensuring a clean wire loop is essential for the accuracy of the flame test.
Test: Identification of Anions, Cations & Gases - Question 7
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What gas is identified through the generation of a white precipitate that dissolves in excess ammonia?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 7
The gas identified through the generation of a white precipitate that dissolves in excess ammonia is ammonia. When this gas is passed through hydrochloric acid, it forms a white precipitate of ammonium chloride. The precipitate dissolves in excess ammonia to form a colorless solution, distinguishing ammonia from other gases in the test. Ammonia is a compound composed of nitrogen and hydrogen and is commonly used in various industrial processes and household products, including cleaning agents and fertilizers.
Test: Identification of Anions, Cations & Gases - Question 8
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Which gas is indicated by the formation of a black precipitate when passed through lead(II) acetate solution?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 8
The gas indicated by the formation of a black precipitate when passed through lead(II) acetate solution is hydrogen sulfide. This gas reacts with lead(II) acetate to produce a black precipitate of lead(II) sulfide. The black coloration of the precipitate helps in the identification of hydrogen sulfide during the gas testing process. Hydrogen sulfide is a colorless, toxic gas with a characteristic foul odor, often associated with rotten eggs. It is produced naturally in processes such as bacterial breakdown of organic matter and is also used in various industrial applications.
Test: Identification of Anions, Cations & Gases - Question 9
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What gas is recognized by the evolution of a gas that turns lime water milky upon passing through it?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 9
The gas recognized by the evolution of a gas that turns lime water milky upon passing through it is carbon dioxide. When carbon dioxide gas is bubbled through lime water (calcium hydroxide solution), it reacts to form calcium carbonate, which is insoluble and gives the solution a milky appearance. This test for carbon dioxide is based on the formation of a white precipitate of calcium carbonate, indicating the presence of carbon dioxide gas. Carbon dioxide is a colorless, odorless gas that is essential for plant photosynthesis and is produced in various natural processes, human activities, and combustion reactions.
Test: Identification of Anions, Cations & Gases - Question 10
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Which gas is identified through the formation of a white precipitate that is insoluble in excess hydrochloric acid?
Detailed Solution for Test: Identification of Anions, Cations & Gases - Question 10
The gas identified through the formation of a white precipitate that is insoluble in excess hydrochloric acid is chlorine. When chlorine gas reacts with a solution of a metal chloride, it forms a white precipitate of the metal chloride, which remains insoluble even in excess hydrochloric acid. This characteristic precipitation reaction helps distinguish chlorine from other gases in the testing process. Chlorine is a highly reactive, greenish-yellow gas with a sharp, suffocating odor, commonly used in disinfectants, bleaches, and as a water treatment agent.
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