Gases in Everyday Life MCQs with Answers

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Weather balloons are filled with Helium because it is a light, non-flammable inert gas that safely lifts the balloon into the atmosphere.

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Chlorine gas has a greenish color.

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The fuel used in an internal combustion engine may be a gas or a liquid.

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<strong>Uranium</strong> is not a fossil fuel; it is a radioactive element used as nuclear fuel.

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Hydrogen diffuses fastest among gases because it has the lowest molecular mass, and according to Graham's law, the rate of diffusion is inversely proportional to the square root of molecular mass.

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Water vapor is the gaseous state of water, formed when water evaporates or boils.

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Kerosene oil is used as jet fuel in aircraft engines.

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Space rockets use fuel in which liquid oxygen acts as the oxidizer mixed with liquid hydrogen as the propellant.

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Oxygen dissolves more in water at high temperature compared to other gases listed, though the solubility of most gases actually decreases with increasing temperature.

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Oxygen (O₂) has the slowest rate of diffusion among common gases because its higher molecular mass results in lower average molecular speed, as per Graham's Law of Diffusion.