Answer
Verified
35.7k+ views
Hint: Lighter gas is a gas that has a lower density than normal atmospheric gases and rises above them as a result. The lightest gas consists of only one proton in its nucleus. It is the most abundant chemical substance in the universe, especially in stars and gas giant planets.
Complete step by step answer:
> Well, Hydrogen is the simplest atom; it has a nucleus with one proton and an electron revolving it. Helium on the other hand has 2 protons and 2 neutrons in its nucleus, and 2 electrons revolving it. The mass of an electron is about 10000 times lesser than that of a proton or neutron which is approximately the same size, so we can leave the electrons as they don't contribute much mass.
> Hydrogen has 1 nucleon (proton) and helium has 4 (2 neutrons and 2 protons) so approximately, a helium atom is four times heavier than a hydrogen atom.
Hence, ${ H }_{ 2 }$ is the lightest gas. Therefore, Option D is the required answer.
Note: Well even though hydrogen can be separated by electrolysis of water, it can't be used because hydrogen is highly reactive and will easily combust in the presence of oxygen. We choose helium because it is an inert gas and so saves us the risk!
Complete step by step answer:
> Well, Hydrogen is the simplest atom; it has a nucleus with one proton and an electron revolving it. Helium on the other hand has 2 protons and 2 neutrons in its nucleus, and 2 electrons revolving it. The mass of an electron is about 10000 times lesser than that of a proton or neutron which is approximately the same size, so we can leave the electrons as they don't contribute much mass.
> Hydrogen has 1 nucleon (proton) and helium has 4 (2 neutrons and 2 protons) so approximately, a helium atom is four times heavier than a hydrogen atom.
Hence, ${ H }_{ 2 }$ is the lightest gas. Therefore, Option D is the required answer.
Note: Well even though hydrogen can be separated by electrolysis of water, it can't be used because hydrogen is highly reactive and will easily combust in the presence of oxygen. We choose helium because it is an inert gas and so saves us the risk!
Recently Updated Pages
To get a maximum current in an external resistance class 1 physics JEE_Main
If a wire of resistance R is stretched to double of class 12 physics JEE_Main
Let f be a twice differentiable such that fleft x rightfleft class 11 maths JEE_Main
Find the points of intersection of the tangents at class 11 maths JEE_Main
For the two circles x2+y216 and x2+y22y0 there isare class 11 maths JEE_Main
The path difference between two waves for constructive class 11 physics JEE_MAIN
Other Pages
Differentiate between homogeneous and heterogeneous class 12 chemistry JEE_Main
Two identical charged spheres suspended from a common class 12 physics JEE_Main
In a CO molecule the distance between C mass12 amu class 12 physics JEE_Main
If a wire of resistance R is stretched to double of class 12 physics JEE_Main
Oxidation state of S in H2S2O8 is A 6 B 7 C +8 D 0 class 12 chemistry JEE_Main
The mole fraction of the solute in a 1 molal aqueous class 11 chemistry JEE_Main