Question

If characteristic gas constant of a given gas is one fourth of universal gas constant, the given gas could be

• A. $He$
• B. $O_2$
• C. $N_2$
• D. $C{O}_2$

Answer 1

The correct option is A $He$

Characteristic gas constant $R_C=\frac{R}{M}$
Where $R$ is universal gas constant and $M$ is molar mass.
$\because R_C=\frac{R}{4}$
$\Rightarrow \frac{R}{4}=\frac{R}{M}$
$\therefore M=4$
Hence, gas could be $He$