41. ___ is:
Answer: Catechol
42. Acetylation of salicylic acid produces:
Answer: Aspirin
43. The hybridization in a C₂H₂ molecule is:
Answer: sp
44. Aldehydes without an α-hydrogen atom undergo self-oxidation and reduction reaction when heated with:
Answer: Aqueous NaOH
45. Used in Gabriel synthesis preparation:
Answer: Primary amine
46. The conjugate base of HCO₃⁻ is:
Answer: CO₂
47. The pKₐ of acetic acid and ammonium hydroxide are 4.76 and 4.75 respectively. The pH of an ammonium acetate solution is:
Answer: 7.005
48. Which of the following is not inconsistent:
Answer: ClO₂⁻
49. In the Clark method, the calculated amount is added to hard water of:
Answer: Lime soda
50. Plaster of Paris is:
Answer: CaSO₄.½H₂O
51. Which of these shows the solubility of sugar at 25°C?
Answer: 37 grams
52. Which of the following is a physical change?
Answer: Bending of iron rod
53. The law of conservation of mass was given by:
Answer: Lavoisier
54. The ratio of oxygen to hydrogen in water is:
Answer: 4:1
55. The mole ratio of 12 grams of magnesium to 16 grams of sulfur atoms is:
Answer: 1:1
56. Which of these has the maximum number of atoms?
Answer: 18 grams O₂
57. An atom is:
Answer: Neutral
58. The correct electronic configuration of sodium is:
Answer: 2, 8, 1
59. Who proposed the first model of the atom?
Answer: Rutherford
60. Who discovered the electron?
Answer: J.J. Thomson