An equimolar (i. e. containing same molar amount) mixture of O2, N2, Kr, and CO2 gases is placed in a 10-L container with a hole just wide enough in the side wall to let the gas molecules pass through one at a time, so that the gases slowly leak out. Which gas will become the most predominant in the container after 20% of the original mixture of gases have leaked out ?

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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where are the choice options?