A clear box has a partition wall at its centre. Each side contains a different gas, as shown. The partition is taken away. The box is then left undisturbed for a long time. The gases do not undergo any reaction. What is observed in the box after this?
- Abrown gas on the right and colourless gas on the left
- Bpale brown gas throughout
- Cseveral distinct clouds of colourless and brown gas throughout
- Dcolourless gas on the right and brown gas on the left