Dioxygen (normal oxygen, $O_{2}$ ) and trioxygen (ozone, $O_{3}$ ) are allotropic forms. Consider equal masses of $O_{2}$ and $O_{3}$ . The correct statements are:

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At same temperature and pressure, their volumes are in the ratio 3:2

At STP, both have same densities

Both contain different number of molecules

Both contain same number of atoms

answer is A, B, C.

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Detailed Solution

For equal masses, ratio of moles of $O_{2}$ and $O_{3} = \frac{1}{32} : \frac{1}{48} = 3 : 2$ .
They contain different number of molecules.
At same temperature, and at same pressure, their volume ratio is $3 : 2$
Ratio of number of atoms $= (3 \times 2) : (2 \times 3) = 1 : 1$
Density, which is mass/volume, is different.