MCQ
$5$ gram each of the following gases at $87^\circ C$ and $750\ mm$ pressure is taken. Which of them will have the least volume?
- A$\ce{HF}$
- B$\ce{HCl}$
- C$\ce{HBr}$
- ✓$\ce{HI}$
✓
Answer
Correct option: D.
$\ce{HI}$
From Ideal gas law,
$\text{PV}=\frac{\text{Weight}}{\text{Molar mass}}\times\text{RT}$
The gas with maximum molecular weight will have minimum volume.
HI has the maximum molecular weight, hence has the least volume.
$\text{PV}=\frac{\text{Weight}}{\text{Molar mass}}\times\text{RT}$
The gas with maximum molecular weight will have minimum volume.
HI has the maximum molecular weight, hence has the least volume.
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