Gasses Mcqs 1- What is the chemical formula of nitrogen gas? A. N₂B. N₄C. N₃D. N View Answer Answer : A. N₂ Description 2- What is the chemical formula of oxygen gas? A. OB. O₂ C. O₃D. O₄ View Answer Answer : B. O₂ Description 3- Which of the following is an inert gas? A. HeliumB. OxygenC. NitrogenD. Carbon dioxide View Answer Answer : A. Helium Description 4- What is the main constituent of natural gas? A. ButaneB. EthaneC. PropaneD. Methane View Answer Answer : D. Methane Description 5- What gas is responsible for the greenhouse effect? A. OxygenB. NitrogenC. HydrogenD. Carbon dioxide View Answer Answer : D. Carbon dioxide Description 6- The ideal gas law is given by which equation? A. PV = nRTB. P = V/nRTC. V = nRT/PD. P = nV/RT View Answer Answer : A. PV = nRT Description 7- Which gas is the most abundant in the Earth's atmosphere? A. ArgonB. OxygenC. NitrogenD. Carbon dioxide View Answer Answer : C. Nitrogen Description 8- What is the molar volume of an ideal gas at standard temperature and pressure (STP)? A. 12.0 LB. 22.4 LC. 24.4 LD. 44.8 L View Answer Answer : B. 22.4 L Description 9- Which of the following gases is colorless, odorless, and non-toxic in small amounts? A. OxygenB. NitrogenC. HydrogenD. Carbon monoxide View Answer Answer : B. Nitrogen Description 10- What is the primary component of air? A. OxygenB. ArgonC. NitrogenD. Carbon dioxide View Answer Answer : C. Nitrogen Description 11- What is the chemical formula of methane gas? A. CH₄ B. C₄H₁₀C. C₆H₆D. C₂H₆ View Answer Answer : A. CH₄ Description 12- Which of the following gases is most commonly used in balloons? A. HeliumB. OxygenC. NitrogenD. Hydrogen View Answer Answer : A. Helium Description 13- What is the gas law that relates pressure and volume? A. Ideal Gas LawB. Avogadro’s LawC. Charles’ LawD. Boyle’s Law View Answer Answer : D. Boyle’s Law Description 14- Which of these gases is known as laughing gas? A. OxygenB. NitrogenC. Nitrous oxideD. Carbon dioxide View Answer Answer : C. Nitrous oxide Description 15- Which of the following gases is heavier than air? A. HeliumB. OxygenC. NitrogenD. Carbon dioxide View Answer Answer : D. Carbon dioxide Description 16- What happens to the volume of a gas if its temperature is increased, according to Charles' Law? A. Volume increasesB. Volume decreasesC. Volume fluctuatesD. Volume remains the same View Answer Answer : A. Volume increases Description 17- What is the main use of carbon dioxide in fire extinguishers? A. To cool the fireB. To produce smokeC. To reduce oxygen availabilityD. To increase the temperature View Answer Answer : C. To reduce oxygen availability Description 18- Which gas is used in the process of photosynthesis? A. OxygenB. Carbon dioxideC. NitrogenD. Hydrogen View Answer Answer : B. Carbon dioxide Description 19- What is the approximate concentration of oxygen in the Earth's atmosphere? A. 11%B. 21%C. 31%D. 41% View Answer Answer : B. 21% Description 20- Which gas is produced during respiration? A. HeliumB. OxygenC. NitrogenD. Carbon dioxide View Answer Answer : D. Carbon dioxide Description 1 2 3 4 5 6 7 8
