Q. How does the chemical sludge appear? (Solved)
1. Gray in colour and not slimy
2. Brown and flocculant like appearance
3. Red/grayish brown
4. Black in colour
- c. Red/grayish brown
1. Gray in colour and not slimy
2. Brown and flocculant like appearance
3. Red/grayish brown
4. Black in colour