Question

At room temperature and pressure, two flasks of equal volume are filled with ${{H}_ {2}} $ and $S{{O}_ {2}} $ respectively. Particles which are equal in number in two flasks are:
a.) atoms
b.) electrons
c.) molecules
d.) neutrons

Answer 1

Hint: Avogadro law of molecules is the only law that is applicable for constant pressure and conditions.

Complete answer:
As per the Avogadro law which was given by Avogadro in 1811 which states that gases of equal volume and those gases should have the same temperature and pressure conditions then they should have equal number of molecules.
Atoms and molecules are different as shown by him. For example, if we consider the reaction of hydrogen and oxygen to produce water, we will see two volumes of hydrogen react with one volume of water to give two volumes of water in which there is no unreacted oxygen left in that reaction.
Therefore, at a constant temperature and pressure conditions two flasks of equal volume that are filled with ${{H}_ {2}} $ and $S{{O}_ {2}} $ respectively will have equal number of moles in them.
So, the number of molecules at a given volume kept at constant pressure and temperature conditions is the same for different gases. Number of atoms of any gas is different in numbers for different gases.
Number of electrons and neutrons of molecules depends on the atomic number of elements present in that molecule. Therefore, it is also different for different molecules.
Therefore, from all the above options, option c that is molecules is correct.

The correct option is C.

Note: Avogadro law which was given by Avogadro is applied which states that there are equal numbers of molecules in the gases of equal volume at the constant temperature and pressure conditions.