Which of the following is true for a gas under conditions of very low temperature?

PV > nRT, because the actual volume of the gas would be more than its ideal value.
PV < nRT, because the volume is smaller due to significant intermolecular force effects.
PV = nRT, because the actual volume of the gas molecules becomes considerable.
PV = nRT, because all gases behave ideally at very low temperatures.

D)

Explanation:

PV/nRT=1, because particles are unable to overcome intermolecular attractions

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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