Number of molecules in $100 \ mL$ of each of $O_2$,$NH_3$,and $CO_2$ at $STP$ are
- AIn the order $CO_2 < O_2 < NH_3$
- BIn the order $NH_3 < O_2 < CO_2$
- CThe same
- D$NH_3 = CO_2 < O_2$
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