#1
What is the chemical symbol for gold?
Au
ExplanationSymbol for the element gold on the periodic table.
#2
Which of the following is a noble gas?
Neon
ExplanationElement belonging to the noble gas group on the periodic table.
#3
What is the chemical symbol for iron?
Fe
ExplanationSymbol for the element iron on the periodic table.
#4
Which gas is most abundant in Earth's atmosphere?
Nitrogen
ExplanationMost prevalent gas in Earth's atmosphere, making up approximately 78% of the air.
#5
What is the chemical symbol for silver?
Ag
ExplanationSymbol for the element silver on the periodic table.
#6
What is the chemical formula for water?
H2O
ExplanationMolecular formula representing water composed of two hydrogen atoms and one oxygen atom.
#7
What is the hardest natural substance on Earth?
Diamond
ExplanationHardest known natural material composed of carbon atoms arranged in a crystal lattice.
#8
Which of the following is a semiconductor material?
Silicon
ExplanationElement commonly used in the production of semiconductors due to its electrical properties.
#9
What is the process of changing a liquid into a gas called?
Vaporization
ExplanationTransformation of a substance from liquid to gas phase.
#10
Which of the following is not a state of matter?
Energy
ExplanationEnergy is not a state of matter but rather a property of matter and other entities.
#11
What is the chemical name for table salt?
Sodium chloride
ExplanationCompound composed of sodium and chloride ions, commonly known as table salt.
#12
Which element is the primary constituent of organic compounds?
Carbon
ExplanationElement forming the backbone of organic molecules due to its bonding properties.
#13
Which material is known as a superconductor at very low temperatures?
Mercury
ExplanationMetallic element exhibiting superconductivity at extremely low temperatures.
#14
Which of the following is used as a fuel in nuclear reactors?
All of the above
ExplanationVarious materials such as uranium, plutonium, and thorium can be used as nuclear reactor fuels.
#15
Which of the following is used as a refrigerant in air conditioners?
Freon
ExplanationCommon name for chlorofluorocarbon compounds used as refrigerants.