91. What is the main component of rust?
A) Iron Oxide
B) Copper Oxide
C) Aluminum Oxide
D) Zinc Oxide
Answer: A) Iron Oxide
92. Which of the following elements is a noble gas?
A) Helium
B) Chlorine
C) Nitrogen
D) Oxygen
Answer: A) Helium
93. Which of the following is a diatomic molecule?
A) O2
B) H2O
C) CO2
D) CH4
Answer: A) O2
94. What is the chemical symbol for silver?
A) Ag
B) Au
C) Pb
D) Pt
Answer: A) Ag
95. Which of the following is a characteristic of acids?
A) Taste sour
B) Feel slippery
C) Turn red litmus paper blue
D) Are non-corrosive
Answer: A) Taste sour
96. Which of the following is a metal?
A) Sulfur
B) Oxygen
C) Carbon
D) Copper
Answer: D) Copper
97. What is the process of solid turning directly into gas called?
A) Melting
B) Freezing
C) Condensation
D) Sublimation
Answer: D) Sublimation
98. What is the electron configuration of Sodium (Na)?
A) 1s2 2s2 2p6 3s1
B) 1s2 2s2 2p6
C) 1s2 2s2 2p6 3s2
D) 1s2 2s2 2p5
Answer: A) 1s2 2s2 2p6 3s1
99. What is the main component of table sugar?
A) Glucose
B) Fructose
C) Sucrose
D) Lactose
Answer: C) Sucrose
100. What is the boiling point of water at sea level?
A) 100°C
B) 0°C
C) 50°C
D) 150°C
Answer: A) 100°C