Chemistry involved in preparation of inorganic and organic compounds and titrimetric and qualitative salt analysis experiments - One Line Questions

1. Which of the following is an example of a redox titration? — Permanganometric titration
2. The titration of a weak base with a strong acid requires an indicator that changes color in which pH range? — Acidic range (pH < 7)
3. The preparation of aspirin from salicylic acid and acetic anhydride is an example of which type of organic reaction? —
4. The 'borax bead test' is primarily used to detect the presence of which type of elements? — Transition metals
5. Which reagent is used to detect the presence of phosphate ions (PO4^3-) by forming a yellow precipitate? — Ammonium molybdate in nitric acid
6. In a titration, the solution of known concentration is called the: — Titrant
7. In the preparation of nitric acid from potassium nitrate and concentrated sulfuric acid, what is the role of concentrated sulfuric acid? — As a dehydrating agent and reactant
8. In the preparation of ethyl acetate, what is the role of concentrated sulfuric acid? — As a catalyst and dehydrating agent
9. Which reagent is commonly used to detect the presence of carbonate ions (CO3^2-) in a salt sample? — Dilute hydrochloric acid
10. Which apparatus is used to heat a solution and allow controlled evaporation? — Evaporating dish
11. Which apparatus is typically used for accurate measurement of liquid volumes in titrations? — Burette
12. Which of the following is a characteristic observation for the presence of nitrate ions (NO3^-) in the ring test? — Brown ring at the interface of the two layers
13. The Lassaigne's test is used to detect the presence of which elements in an organic compound? — Halogens, Nitrogen, and Sulfur
14. In the preparation of ammonia gas, drying is typically done using: — Quicklime (CaO)
15. In the preparation of hydrogen gas by the reaction of zinc with dilute sulfuric acid, the acid is usually added slowly to: — Control the rate of reaction and prevent excessive foaming
16. What is the characteristic flame coloration for sodium ions (Na+)? — Golden yellow
17. The preparation of an ether from two molecules of an alcohol in the presence of concentrated sulfuric acid at a specific temperature is an example of: — Dehydration (intermolecular)
18. Which method is commonly used for the purification of solid organic compounds? — Crystallisation
19. The preparation of 'soap' from fats or oils and a strong base is called: — Saponification
20. Which of the following is a primary alcohol? — Ethanol
21. In the analysis of cations, Group V usually contains which ion? — NH4^+
22. Which of the following is a characteristic test for detecting the presence of starch? — Iodine solution
23. Which test is used to detect the presence of chlorides, bromides, or iodides by forming a precipitate with silver nitrate? — Silver nitrate test
24. In the detection of ammonium ions (NH4^+), adding a strong base like NaOH and heating results in the evolution of which gas? — Ammonia
25. The preparation of an ester from a carboxylic acid and an alcohol is known as: — Fischer esterification
26. The preparation of an alkyl halide from an alcohol using SOCl2 is advantageous because: — The byproducts (SO2 and HCl) are gases and easily removed
27. The preparation of ethyl chloride from ethanol and thionyl chloride is preferred because: — The byproducts HCl and SO2 are gaseous and easily removed
28. What is the principle of gravimetric analysis? — Measuring the mass of a pure solid element or compound that is equivalent to the analyte
29. For the titration of a weak acid with a strong base, which indicator is most suitable? — Phenolphthalein
30. Which gas is produced when a nitrate salt is heated strongly with copper turnings and concentrated sulfuric acid? — Nitrogen dioxide (NO2)
31. The preparation of ethyl bromide from ethanol and hydrobromic acid is an example of: — Nucleophilic substitution
32. The preparation of aniline from nitrobenzene using Sn/HCl is a specific type of: — Reduction
33. Which of the following is a common method for preparing esters in the laboratory? — Fischer esterification
34. Which indicator is typically used for the titration of a strong acid with a strong base? — All of the above
35. The preparation of an aldehyde from a primary alcohol using PCC (Pyridinium Chlorochromate) is an example of: — Oxidation
36. What is the principle behind qualitative salt analysis? — Selective precipitation of ions
37. In the preparation of aniline from nitrobenzene, which reducing agent is commonly employed? — Tin (Sn) or Iron (Fe) in the presence of HCl
38. Which substance is used as a primary standard in acid-base titrations? — Anhydrous sodium carbonate
39. The 'Beilstein test' is used to detect the presence of which element in an organic compound? — Halogens
40. The endpoint of a titration is the point at which: — The indicator changes color
41. What is the primary purpose of the 'Sodium Fusion Test' in organic qualitative analysis? — To convert inorganic elements present in the organic compound into ionic form for easier detection
42. In qualitative salt analysis, what is the purpose of the dry test? — To detect the presence of volatile radicals or characteristic properties
43. What is the purpose of heating the salt solution with sodium carbonate in the preparation of insoluble salts? — To precipitate the cation as a carbonate
44. Why is it important to wash the precipitate in gravimetric analysis? — To remove soluble impurities adhering to the precipitate
45. When testing for sulfate ions (SO4^2-), why is dilute hydrochloric acid added before barium chloride solution? — To prevent the precipitation of other interfering anions like sulfites and carbonates
46. What is the primary function of an indicator in a titration? — To provide a visual signal for the endpoint
47. What is the purpose of adding dilute HCl to the salt solution before precipitating Group II cations with H2S? — To ensure that only Group II cations precipitate as sulfides and not those of Group III
48. What is the purpose of the Group Separation scheme in qualitative analysis? — To systematically separate cations into different groups based on their properties with specific reagents
49. In the qualitative analysis of anions, what is the purpose of adding dilute HCl or H2SO4 before adding BaCl2? — To ensure that only the desired anion precipitates and to avoid interference from other anions that form insoluble barium salts (e.g., carbonates, sulfites)
50. Which apparatus is used for accurately measuring and delivering variable amounts of liquid, typically in a laboratory preparation? — Pipette
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