To which of the following mixtures Dalton’s law is not applicable?

i) ${\mathrm{NH}}_3=\mathrm{HCl}\to {\mathrm{NH}}_4\mathrm{Cl}$ 

${\mathrm{NH}}_3+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{NH}}_4\mathrm{OH}$ 

The above reactions occurs at room temperature .

ii) A mixture of ${\mathrm{CO}}_2 \& \mathrm{CO}$ at room temperature is thermally stable

iii) A mixture of He and ${\mathrm{H}}_2$ do not react with each other.