Correct Answer: A) Oxygen
Explanation: Oxygen makes up about 46.6% of the Earth’s crust by weight, making it the most abundant element. It is followed by silicon at about 27.7%.
A) Hydrogen
B) Carbon
C) Sulfur
D) Oxygen
Correct Answer: C) Sulfur
Explanation: Sulfur is often referred to as the “king of chemicals” because of its wide range of applications in industry, including in the production of sulfuric acid, which is a key chemical used in many industrial processes.
A) Oxygen
B) Silicon
C) Aluminum
D) Iron
Correct Answer: A) Oxygen
Explanation: Oxygen makes up about 46.6% of the Earth’s crust by weight, making it the most abundant element. It is followed by silicon at about 27.7%.
A) Carbon dioxide
B) Methane
C) Nitrogen
D) Nitrous oxide
Correct Answer: D) Nitrous oxide
Explanation: Nitrous oxide (N₂O) is known as “laughing gas” because it can induce a euphoric effect when inhaled, often leading to laughter.
A) NaCl
B) KCl
C) NaHCO₃
D) CaCO₃
Correct Answer: A) NaCl
Explanation: Table salt is chemically known as sodium chloride, with the formula NaCl.
A) Tungsten
B) Iron
C) Carbon
D) Platinum
Correct Answer: A) Tungsten
Explanation: Tungsten has the highest melting point of all elements, at 3422°C (6192°F), making it extremely useful in high-temperature applications.
A) 0
B) 7
C) 14
D) 10
Correct Answer: B) 7
Explanation: Pure water is neutral, with a pH value of 7, indicating an equal concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻).
A) Hydrochloric acid
B) Nitric acid
C) Sulfuric acid
D) Acetic acid
Correct Answer: C) Sulfuric acid
Explanation: Sulfuric acid (H₂SO₄) is used in lead-acid batteries found in cars due to its strong acidic nature and ability to act as an electrolyte.
A) Lithium
B) Aluminum
C) Magnesium
D) Sodium
Correct Answer: A) Lithium
Explanation: Lithium is the lightest metal, with a density of about 0.534 g/cm³, and is used in lightweight battery technologies.
A) Copper
B) Aluminum
C) Tungsten
D) Nickel
Correct Answer: C) Tungsten
Explanation: Tungsten is used in light bulb filaments because of its high melting point and durability at high temperatures.
A) Water
B) Hydrogen peroxide
C) Sulfuric acid
D) Acetone
Correct Answer: B) Hydrogen peroxide
Explanation: H₂O₂ is known as hydrogen peroxide, a chemical compound often used as a disinfectant and bleaching agent.
A) Carbon monoxide
B) Methane
C) Nitrogen
D) Oxygen
Correct Answer: A) Carbon monoxide
Explanation: Carbon monoxide (CO) is called the “silent killer” because it is a colorless, odorless gas that can cause poisoning and death without warning.
A) Oxygen
B) Carbon
C) Hydrogen
D) Nitrogen
Correct Answer: A) Oxygen
Explanation: Oxygen makes up about 65% of the human body by weight, mainly found in water molecules.
A) Silver
B) Mercury
C) Lead
D) Platinum
Correct Answer: B) Mercury
Explanation: Mercury is commonly referred to as quicksilver due to its liquid state at room temperature and its silvery appearance.
A) Sodium carbonate
B) Sodium bicarbonate
C) Sodium chloride
D) Sodium hydroxide
Correct Answer: B) Sodium bicarbonate
Explanation: Baking soda is chemically known as sodium bicarbonate (NaHCO₃), used in baking and as an antacid.
A) Uranium
B) Boron
C) Graphite
D) Plutonium
Correct Answer: C) Graphite
Explanation: Graphite is used as a moderator in nuclear reactors to slow down neutrons, allowing the nuclear reaction to be controlled more effectively.
A) NH₃
B) NO₃
C) N₂O
D) NH₄
Correct Answer: A) NH₃
Explanation: Ammonia is a compound with the chemical formula NH₃, consisting of one nitrogen and three hydrogen atoms.
A) Methane
B) Ethane
C) Propane
D) Butane
Correct Answer: A) Methane
Explanation: Methane (CH₄) is known as marsh gas because it is produced by the anaerobic decomposition of organic matter in wetlands.
A) Fluorine
B) Oxygen
C) Chlorine
D) Nitrogen
Correct Answer: A) Fluorine
Explanation: Fluorine is the most electronegative element, with an electronegativity of 3.98 on the Pauling scale, making it highly reactive.
A) Lead
B) Lithium
C) Zinc
D) Copper
Correct Answer: B) Lithium
Explanation: Lithium is commonly used in rechargeable batteries, including those in mobile phones and electric vehicles, due to its high electrochemical potential.
A) Propane
B) Butane
C) Ethane
D) Methane
Correct Answer: D) Methane
Explanation: Natural gas primarily consists of methane (CH₄), which is used as a fuel for heating, cooking, and electricity generation.
& stay ahead of your competitors!
* Subscribe to our email newsletter to get the latest posts delivered right to your email.