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 Flashcard- Principles Related to Practical Chemistry 30 Flashcards |
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What is the principle behind Lassaigne's test for detecting nitrogen in organic compounds? |
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Lassaigne's test involves fusing the organic compound with sodium metal, then testing the sodium extract with Nessler's reagent. The formation of a brown precipitate indicates the presence of ammonium ions (NH₄⁺), confirming nitrogen. |
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Fill in the blanks: Sulphur is detected in organic compounds by the reaction of the sodium extract with ___, resulting in a ___ precipitate. |
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Lead acetate; black 
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True or False: The presence of halogens in organic compounds can be confirmed by the formation of a white precipitate with silver nitrate. |
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True |
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What color indicates the presence of phenolic compounds when tested with ferric chloride? |
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Voilet coloration
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Riddle: I am a test that turns a solution blue for amino acids, but when I react with acetic acid, I turn red. What am I? |
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Ninhydrin test |
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Describe the reaction for detecting the carboxyl group in organic compounds. |
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The carboxyl group is detected by adding sodium bicarbonate, which releases carbon dioxide gas, indicated by effervescence, confirming the presence of a carboxyl group. |
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What is the reaction to prepare Mohr's salt? |
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Mohr's salt is prepared by reacting ferrous sulfate (FeSO₄) with ammonium sulfate ((NH₄)₂SO₄) in the presence of excess dilute sulfuric acid, forming (NH₄)₂Fe(SO₄)₂ and water. |
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Fill in the blank: The preparation of acetanilide involves the reaction of aniline with ___ to form C₆H₅NHCOCH₃. |
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Acetic anhydride |
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What occurs in the titration of oxalic acid with potassium permanganate in acidic medium? |
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The reaction produces a color change, resulting in the formation of carbon dioxide and manganese ions, indicating the endpoint of the titration. |
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True or False: A yellow precipitate in qualitative salt analysis indicates the presence of lead ions (Pb²⁺). |
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True
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What is formed when zinc ions (Zn²⁺) react with ammonia? |
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A white precipitate of [Zn(NH₃)₂(H₂O)₂]²⁺ is formed. |
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Riddle: I am a black precipitate formed when sulfide ions react with lead acetate. What am I? |
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Lead sulfide (PbS) |
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Fill in the blanks: The enthalpy change during the dissolution of CuSO₄ in water is measured as the ___ of solution. |
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Enthalpy |
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Explain how a strong acid-strong base titration reaches its endpoint using a pH indicator. |
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The endpoint is reached when the pH indicator changes color, indicating that the acid has completely reacted with the base to form water and a salt. |
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What is the reaction that confirms the presence of sulfate ions (SO₄²⁻) during qualitative analysis? |
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The reaction with barium chloride (BaCl₂) forms a white precipitate of barium sulfate (BaSO₄), confirming the presence of sulfate ions. |
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