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Which gas is the lightest of all gases?
A. Helium
B. Hydrogen
C. Oxygen
D. Nitrogen
Correct Answer Is Option = Hydrogen
Notes / Explanation
The lightest of all gases is hydrogen, which is also the lightest and simplest of all the chemical elements. Gases vary in how light or heavy they are, that is, in how much a given volume of the gas weighs, and among all the gases, hydrogen is the lightest, being lighter than any other gas. Hydrogen is a gas that has no colour, no smell and no taste, and it is made up of the lightest of all the elements. Because it is so light, hydrogen tends to rise upward in the air, and this property was made use of in the past, when hydrogen was used to fill balloons and large airships to make them rise into the air, since a gas lighter than air will cause a balloon to float upward. However, hydrogen has the serious drawback of being highly flammable, catching fire and burning very easily, which made its use in airships dangerous, and after some serious accidents its use for this purpose was largely abandoned in favour of another light gas that, although slightly heavier, is safe because it does not burn. Hydrogen is a very important element and gas for other reasons. It is by far the most abundant element in the universe as a whole, making up the greater part of the matter in the stars, including the Sun, where it serves as the fuel for the processes that make the stars shine. On the Earth, hydrogen is found in very large quantities in combination with other elements, most importantly in water, which is a compound of hydrogen and oxygen. Hydrogen has various important uses, and there is great interest in its potential as a clean fuel, since when it burns it forms water without producing the harmful gases that come from burning other fuels. The study of the gases and the elements and their properties is a part of chemistry. For PPSC and other competitive examinations, the key points to remember are that the lightest of all gases is hydrogen, that it is the lightest and simplest of all the chemical elements, being a colourless, odourless gas, that because it is so light it was used in the past to fill balloons and airships but was dangerous because it is highly flammable, and that it is the most abundant element in the universe and has important uses, including its potential as a clean fuel.
