Hydrogen chloride gas ($M_r = 36.5$) is given off at P in the apparatus illustrated. The Universal Indicator paper becomes red after 38 s. The experiment is carried out again with sulfur dioxide ($M_r = 64$). What happens with sulfur dioxide?
- AUniversal Indicator turns blue; time for Universal Indicator to change colour = $26\ \text{s}$
- BUniversal Indicator turns blue; time for Universal Indicator to change colour = $51\ \text{s}$
- CUniversal Indicator turns red; time for Universal Indicator to change colour = $26\ \text{s}$
- DUniversal Indicator turns red; time for Universal Indicator to change colour = $51\ \text{s}$