Tiny crystals of purple $\text{KMnO}_4$ ($M_r = 158$) and orange $\text{K}_2\text{Cr}_2\text{O}_7$ ($M_r = 294$) were put at the centres of separate petri dishes containing agar jelly. They were then left under identical physical conditions. After a period of time, the colour from each substance had spread out as shown. The arrow lengths show the comparative distances moved by particles of each substance. Which statement is correct?
- ADiffusion is faster in dish 1 because the mass of the particles is greater.
- BDiffusion is faster in dish 2 because the mass of the particles is greater.
- CDiffusion is slower in dish 1 because the mass of the particles is smaller.
- DDiffusion is slower in dish 2 because the mass of the particles is greater.