Under standard room temperature and pressure conditions, which of the following specific gas mixture — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

Dalton's Law requires gases to be strictly non-reacting. $NH_3$ and $HCl$ react spontaneously at room temperature to form solid $NH_4Cl$. $NO$ and $O_2$ react spontaneously to form $NO_2$. However, $N_2$ and $H_2$ require a catalyst and high temperature/pressure (Haber process), and $He$ is inert, so mixtures C and D will obey the law at room conditions.