Question

The molecules of which of the following gas have higher speed?

• A. Hydrogen at $-{50}^{\circ }C$
• B. Methane at $298K$
• C. Nitrogen at ${1000}^{\circ }C$
• D. Oxygen at $0^{\circ }C$

Answer 1

The correct option is A Hydrogen at $-{50}^{\circ }C$

$u=\sqrt{\frac{3RT}{M}}$
The gas with higher temperature and lower molecular weight has higher molecular speed.
Among the given gases, hydrogen at $-50{}^{o}C$ has maximum value of T/M and highest speed.