61. Elements with the same atomic number but different mass numbers are called:
Answer: Isotopes
62. Elements A, B, C, and D have atomic numbers 12, 13, 15, and 3, respectively. Which element cannot form a cation?
Answer: C
63. The number of electrons in a sulfide ion (S²⁻) is:
Answer: 10
64. Elements with a single valency electron:
Answer: Can be either metals or non-metals
65. Which of these is an inorganic compound?
Answer: KCl
66. Which of the following is sodium peroxide?
Answer: Na₂O₂
67. Which of the following compounds has a polar covalent bond?
Answer: H₂O
68. The important component group of organic compounds is:
Answer: Group 14
69. Which of the following has the highest number of bonding electrons?
Answer: P
70. Which of the following elements has the largest atomic radius?
Answer: K
71. The general formula for alkane is
Answer: CnH₂n+2
72. The functional group of aldehyde is
Answer: -CHO
73. Alkene is also known as
Answer: Olefin
74. Which of the following is an ore of aluminum?
Answer: Bauxite
75. An element reacts with oxygen to form a compound with a high melting point and is soluble in water. The element is
Answer: Ca
76. Which of the following combinations gives a displacement reaction?
Answer: Solution of AgNO₃ and copper metal
77. A compound with the same molecular formula but different structural formula is called
Answer: Isomerism
78. The IUPAC name of the compound CH₃-O-C₂H₅ is
Answer: Methoxyethane
79. The compound that participates in an addition reaction is
Answer: H-CEC-H
80. Which of the following is vinegar?
Answer: CH₃COOH