Two features of a gas, $G$, are stated below. $\bullet$ $G$ changes copper(II) oxide into a pink-brown solid. $\bullet$ The volume of $1.4\,\text{g}$ of $G$ is $1.2\,\text{dm}^3$ at room temperature and pressure. What is $G$?
- Acarbon monoxide, $\text{CO}$
- Bhydrogen, $\text{H}_2$
- Cnitrogen, $\text{N}_2$
- Dnitrogen monoxide, $\text{NO}$