Question

According to Avogadro's law, all gases of equal volumes at same temp. And pressure have same no. Of molecules. So why, here, only CO is the correct option?Why not all the four options are correct??

Answer 1

But it is law which is applicable only when the molecular mass of the gases are also equal.
So as your answer is (b) CO and other options have different masses as that compared to CO so it's obvious that other gases should have different no. of molecules or we can say by the ideal gas equation Pv=nRt all the gases will have different no. of moles as these gases will have different amount of volume from each other.

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Answer 2

for no. of molecules to be same no. of moles must also be same and no.of moles = given mass /molecular mass .if we consider given mass to be same for all then the gases having same Mol formula will have same no.of moles and here CO and N2 have same Mol formula . (no.of molecules = no.of moles × avagadro no. )