MCQ
In which of the following gas the root mean square velocity will be minimum (at const. temperature)
- AOxygen
- ✓Carbon dioxide
- CHydrogen
- DSame of alll
✓
Answer
Correct option: B.
Carbon dioxide
b
${V_{rms}}\, = \,\sqrt {\frac{{3RT}}{{{M_W}}}} \, \Rightarrow \,{V_{rms}}\, \propto \,\frac{1}{{\sqrt {{M_W}} }}$
${V_{rms}}\, = \,\sqrt {\frac{{3RT}}{{{M_W}}}} \, \Rightarrow \,{V_{rms}}\, \propto \,\frac{1}{{\sqrt {{M_W}} }}$
$\therefore \,\,\,{V_{rms,C{o_2}}}\,$ will be minimum
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